gitk: Adjust the menu line numbers to compensate for the new entry

Commit d835dbb ("gitk: Add a "Copy commit summary" command",
2015-08-13) in the upstream gitk repo added a new context menu entry.
Therefore, the line numbers of the entries below the new one need to be
adjusted when their text or state is changed.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -8896,13 +8896,13 @@ proc rowmenu {x y id} {
     if {$id ne $nullid && $id ne $nullid2} {
 	set menu $rowctxmenu
 	if {$mainhead ne {}} {
-	    $menu entryconfigure 7 -label [mc "Reset %s branch to here" $mainhead] -state normal
+	    $menu entryconfigure 8 -label [mc "Reset %s branch to here" $mainhead] -state normal
 	} else {
-	    $menu entryconfigure 7 -label [mc "Detached head: can't reset" $mainhead] -state disabled
+	    $menu entryconfigure 8 -label [mc "Detached head: can't reset" $mainhead] -state disabled
 	}
-	$menu entryconfigure 9 -state $mstate
 	$menu entryconfigure 10 -state $mstate
 	$menu entryconfigure 11 -state $mstate
+	$menu entryconfigure 12 -state $mstate
     } else {
 	set menu $fakerowmenu
     }