gitk: Make "find" on "Files" work again.

It was broken by the change to supply just the child id to
git-diff-tree rather than both child and parent.

Signed-off-by: Paul Mackerras <paulus@samba.org>
1 file changed
tree: 9115d2e81197e227eb3360b383f05c3629dca43c
  1. gitk