test-paths: fix up json output to match $TESTTMP on Windows

Without this, the paths were in the form "C:\\Users\\Matt\\AppData...".  The
test runner wouldn't collapse it down to $TESTTMP, which uses single
backslashes.

tests/test-paths.t

@@ -1,173 +1,173 b''
   $ hg init a
   $ hg clone a b
   updating to branch default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd a
 
 with no paths:
 
   $ hg paths
   $ hg paths unknown
   not found!
   [1]
   $ hg paths -Tjson
   [
   ]
 
 with paths:
 
   $ echo '[paths]' >> .hg/hgrc
   $ echo 'dupe = ../b#tip' >> .hg/hgrc
   $ echo 'expand = $SOMETHING/bar' >> .hg/hgrc
   $ hg in dupe
   comparing with $TESTTMP/b (glob)
   no changes found
   [1]
   $ cd ..
   $ hg -R a in dupe
   comparing with $TESTTMP/b (glob)
   no changes found
   [1]
   $ cd a
   $ hg paths
   dupe = $TESTTMP/b#tip (glob)
   expand = $TESTTMP/a/$SOMETHING/bar (glob)
   $ SOMETHING=foo hg paths
   dupe = $TESTTMP/b#tip (glob)
   expand = $TESTTMP/a/foo/bar (glob)
 #if msys
   $ SOMETHING=//foo hg paths
   dupe = $TESTTMP/b#tip (glob)
   expand = /foo/bar
 #else
   $ SOMETHING=/foo hg paths
   dupe = $TESTTMP/b#tip (glob)
   expand = /foo/bar
 #endif
   $ hg paths -q
   dupe
   expand
   $ hg paths dupe
   $TESTTMP/b#tip (glob)
   $ hg paths -q dupe
   $ hg paths unknown
   not found!
   [1]
   $ hg paths -q unknown
   [1]
 
 formatter output with paths:
 
   $ echo 'dupe:pushurl = https://example.com/dupe' >> .hg/hgrc
-  $ hg paths -Tjson
+  $ hg paths -Tjson | sed 's|\\\\|\\|g'
   [
    {
     "name": "dupe",
     "pushurl": "https://example.com/dupe",
-    "url": "$TESTTMP/b#tip"
+    "url": "$TESTTMP/b#tip" (glob)
    },
    {
     "name": "expand",
-    "url": "$TESTTMP/a/$SOMETHING/bar"
+    "url": "$TESTTMP/a/$SOMETHING/bar" (glob)
    }
   ]
-  $ hg paths -Tjson dupe
+  $ hg paths -Tjson dupe | sed 's|\\\\|\\|g'
   [
    {
     "name": "dupe",
     "pushurl": "https://example.com/dupe",
-    "url": "$TESTTMP/b#tip"
+    "url": "$TESTTMP/b#tip" (glob)
    }
   ]
   $ hg paths -Tjson -q unknown
   [
   ]
   [1]
 
 password should be masked in plain output, but not in machine-readable output:
 
   $ echo 'insecure = http://foo:[e-mail]/' >> .hg/hgrc
   $ hg paths insecure
   http://foo:***@example.com/
   $ hg paths -Tjson insecure
   [
    {
     "name": "insecure",
     "url": "http://foo:[e-mail]/"
    }
   ]
 
   $ cd ..
 
 sub-options for an undeclared path are ignored
 
   $ hg init suboptions
   $ cd suboptions
 
   $ cat > .hg/hgrc << EOF
   > [paths]
   > path0 = https://example.com/path0
   > path1:pushurl = https://example.com/path1
   > EOF
   $ hg paths
   path0 = https://example.com/path0
 
 unknown sub-options aren't displayed
 
   $ cat > .hg/hgrc << EOF
   > [paths]
   > path0 = https://example.com/path0
   > path0:foo = https://example.com/path1
   > EOF
 
   $ hg paths
   path0 = https://example.com/path0
 
 :pushurl must be a URL
 
   $ cat > .hg/hgrc << EOF
   > [paths]
   > default = /path/to/nothing
   > default:pushurl = /not/a/url
   > EOF
 
   $ hg paths
   (paths.default:pushurl not a URL; ignoring)
   default = /path/to/nothing
 
 #fragment is not allowed in :pushurl
 
   $ cat > .hg/hgrc << EOF
   > [paths]
   > default = https://example.com/repo
   > invalid = https://example.com/repo
   > invalid:pushurl = https://example.com/repo#branch
   > EOF
 
   $ hg paths
   ("#fragment" in paths.invalid:pushurl not supported; ignoring)
   default = https://example.com/repo
   invalid = https://example.com/repo
   invalid:pushurl = https://example.com/repo
 
   $ cd ..
 
 'file:' disables [paths] entries for clone destination
 
   $ cat >> $HGRCPATH <<EOF
   > [paths]
   > gpath1 = http://hg.example.com
   > EOF
 
   $ hg clone a gpath1
   abort: cannot create new http repository
   [255]
 
   $ hg clone a file:gpath1
   updating to branch default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd gpath1
   $ hg -q id
   000000000000
 
   $ cd ..