wayland: Fix key repeat

Key repeat under X is not affected by modifiers. And on some systems
(e.g my Thinkpad), NumLock is permanently on, rendering key repeat
nonfunctional. This commit changes the Wayland backend to do
key repeat regardless of modifiers.
http://bugzilla.gnome.org/show_bug.cgi?id=695497

gdk/wayland/gdkdevice-wayland.c

@@ -983,10 +983,6 @@ deliver_key_event(GdkWaylandDeviceData *device,
         }
       return FALSE;
     }
-  else if (device->modifiers)
-    {
-      return FALSE;
-    }
   else switch (device->repeat_count)
     {
     case 1: