filemerge: remove leading space from " no tool found..."

I could not find or see a reason for the unusual formatting. The lines
following it in the test cases are not indented.

mercurial/filemerge.py

@@ -177,7 +177,7 b' def _iprompt(repo, mynode, orig, fcd, fc'
     fd = fcd.path()
 
     try:
-        index = ui.promptchoice(_(" no tool found to merge %s\n"
+        index = ui.promptchoice(_("no tool found to merge %s\n"
                                   "keep (l)ocal or take (o)ther?"
                                   "$$ &Local $$ &Other") % fd, 0)
         choice = ['local', 'other'][index]

tests/test-merge-tools.t

@@ -531,7 +531,7 b' ui.merge specifies internal:prompt:'
   true.executable=cat
   # hg update -C 1
   $ hg merge -r 2 --config ui.merge=internal:prompt
-   no tool found to merge f
+  no tool found to merge f
   keep (l)ocal or take (o)ther? l
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   (branch merge, don't forget to commit)
@@ -553,7 +553,7 b' prompt with EOF'
   true.executable=cat
   # hg update -C 1
   $ hg merge -r 2 --config ui.merge=internal:prompt --config ui.interactive=true
-   no tool found to merge f
+  no tool found to merge f
   keep (l)ocal or take (o)ther? 
   0 files updated, 0 files merged, 0 files removed, 1 files unresolved
   use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
@@ -567,7 +567,7 b' prompt with EOF'
   # hg resolve --list
   U f
   $ hg resolve --all --config ui.merge=internal:prompt --config ui.interactive=true
-   no tool found to merge f
+  no tool found to merge f
   keep (l)ocal or take (o)ther? 
   [1]
   $ aftermerge
@@ -581,7 +581,7 b' prompt with EOF'
   U f
   $ rm f
   $ hg resolve --all --config ui.merge=internal:prompt --config ui.interactive=true
-   no tool found to merge f
+  no tool found to merge f
   keep (l)ocal or take (o)ther? 
   [1]
   $ aftermerge
@@ -593,7 +593,7 b' prompt with EOF'
   # hg resolve --list
   U f
   $ hg resolve --all --config ui.merge=internal:prompt
-   no tool found to merge f
+  no tool found to merge f
   keep (l)ocal or take (o)ther? l
   (no more unresolved files)
   $ aftermerge

tests/test-merge-types.t

@@ -171,7 +171,7 b' Update to link with local change should '
    a: versions differ -> m (premerge)
   (couldn't find merge tool hgmerge|tool hgmerge can't handle symlinks) (re)
   picked tool ':prompt' for a (binary False symlink True)
-   no tool found to merge a
+  no tool found to merge a
   keep (l)ocal or take (o)ther? l
   0 files updated, 1 files merged, 0 files removed, 0 files unresolved
   $ hg diff --git