display-config-dbus: Consider interlaced flag for similar modes

Otherwise we could end up picking an interlaced mode when we want a
non-interlaced one or vice-versa since they might have equal
refresh rates.

https://bugzilla.gnome.org/show_bug.cgi?id=785949

panels/display/cc-display-config-dbus.c

@@ -619,7 +619,8 @@ cc_display_monitor_dbus_get_closest_mode (CcDisplayMonitorDBus *self,
           similar->height != mode->height)
         continue;
 
-      if (similar->refresh_rate == mode->refresh_rate)
+      if (similar->refresh_rate == mode->refresh_rate &&
+          (similar->flags & MODE_INTERLACED) == (mode->flags & MODE_INTERLACED))
         {
           best = similar;
           break;