test-subrepo-svn.t: ignore that subversion %-encodes $TESTTMP

Use a glob instead of expecting $TESTTMP.

tests/test-subrepo-svn.t

@@ -73,7 +73,7 b' debugsub'
 
   $ hg debugsub
   path s
-   source   file://$TESTTMP/svn-repo/src
+   source   file://*/svn-repo/src (glob)
    revision 2
 
 change file in svn and hg, commit
@@ -92,7 +92,7 b' change file in svn and hg, commit'
   At revision 3.
   $ hg debugsub
   path s
-   source   file://$TESTTMP/svn-repo/src
+   source   file://*/svn-repo/src (glob)
    revision 3
 
   $ echo a > s/a
@@ -192,7 +192,7 b' debugsub in clone'
 
   $ hg debugsub
   path s
-   source   file://$TESTTMP/svn-repo/src
+   source   file://*/svn-repo/src (glob)
    revision 3
 
 verify subrepo is contained within the repo directory