git.el: Improve the confirmation message on remove and revert.
git.el: Improve the confirmation message on remove and revert.

If there's only one file, print its name instead of just "1 file".

Signed-off-by: Alexandre Julliard <a3c1c71ac0d85b781251f68481a696b8e4d0781d@winehq.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git