resourceutil: correct the root path for file based lookup under py2exe

This silly copy/paste error caused "Mercurial" to be truncated from
"C:\Program Files".  The fact that "helptext" and "defaultrc" are now in a
subpackage of "mercurial" added it back on, and everything seemed to work.  But
that broke if not installed to the default directory, and also caused TortoiseHg
to look at Mercurial's config files instead of its own.

Differential Revision: https://phab.mercurial-scm.org/D8054

mercurial/utils/resourceutil.py

@@ -33,7 +33,7 b' def mainfrozen():'
 if mainfrozen() and getattr(sys, 'frozen', None) != 'macosx_app':
     # executable version (py2exe) doesn't support __file__
     datapath = os.path.dirname(pycompat.sysexecutable)
-    _rootpath = os.path.dirname(datapath)
+    _rootpath = datapath
 else:
     datapath = os.path.dirname(os.path.dirname(pycompat.fsencode(__file__)))
     _rootpath = os.path.dirname(datapath)