ui: fix extra space in username abort

mercurial/ui.py

@@ -451,7 +451,7 b' class ui(object):'
         if not user:
             raise util.Abort(_('no username supplied'),
                              hint=_('use "hg config --edit" '
-                                    ' to set your username'))
+                                    'to set your username'))
         if "\n" in user:
             raise util.Abort(_("username %s contains a newline\n") % repr(user))
         return user

tests/test-committer.t

@@ -50,7 +50,7 b''
   $ echo "username = " >> .hg/hgrc
   $ hg commit -m commit-1
   abort: no username supplied
-  (use "hg config --edit"  to set your username)
+  (use "hg config --edit" to set your username)
   [255]
   $ rm .hg/hgrc
   $ hg commit -m commit-1 2>&1

tests/test-record.t

@@ -252,7 +252,7 b' Modify end of plain file with username u'
   $ unset HGUSER
   $ hg record --config ui.username= -d '8 0' -m end plain
   abort: no username supplied
-  (use "hg config --edit"  to set your username)
+  (use "hg config --edit" to set your username)
   [255]