clean: replace match_pathspec() with dir_path_match()

clean: replace match_pathspec() with dir_path_match()

This instance was left out when many match_pathspec() call sites that
take input from dir_entry were converted to dir_path_match() because
it passed a path with the trailing slash stripped out to match_pathspec()
while the others did not. Stripping for all call sites back then would
be a regression because match_pathspec() did not know how to match
pathspec foo/ against _directory_ foo (the stripped version of path
"foo/").

match_pathspec() knows how to do it now. And dir_path_match() strips
the trailing slash also. Use the new function, because the stripping
code is removed in the next patch.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>