test-largefiles.t: fix find quirk on OSX

For some reason, find utility seems to preserve the trailing slash and
append a new one on OSX:

  $ find somedir/
  somedir/
  somedir//somefile

tests/test-largefiles.t

@@ -1614,8 +1614,8 b" Test commit's addremove option prior to "
   A large.dat
   A large2.dat
   A normal
-  $ find .hglf/ | sort
-  .hglf/
+  $ find .hglf | sort
+  .hglf
   .hglf/large.dat
   .hglf/large2.dat