gitk: Map KP_Divide to focus the search box

Commit 97bed03 changed the behavior of the '/' key on the keyboard,
but the '/' on the keypad was left unused.  They now both do the same
thing.

Signed-off-by: Michele Ballabio <barra_cuda@katamail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -2313,6 +2313,7 @@ proc makewindow {} {
     bindkey d "$ctext yview scroll 18 units"
     bindkey u "$ctext yview scroll -18 units"
     bindkey / {focus $fstring}
+    bindkey <Key-KP_Divide> {focus $fstring}
     bindkey <Key-Return> {dofind 1 1}
     bindkey ? {dofind -1 1}
     bindkey f nextfile