git-gui: fix shortcut for menu "Commit/Revert Changes"

The shortcut was not properly recognized previously.

Signed-off-by: Heiko Voigt <heiko.voigt@mahr.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
diff --git a/git-gui.sh b/git-gui.sh
index 1fb3cbf..85fbc02 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -3371,6 +3371,8 @@
 bind .   <$M1B-Key-S> do_signoff
 bind .   <$M1B-Key-t> do_add_selection
 bind .   <$M1B-Key-T> do_add_selection
+bind .   <$M1B-Key-j> do_revert_selection
+bind .   <$M1B-Key-J> do_revert_selection
 bind .   <$M1B-Key-i> do_add_all
 bind .   <$M1B-Key-I> do_add_all
 bind .   <$M1B-Key-minus> {show_less_context;break}