Allow rendering of input method windows also if screen is locked

Needed to get maliit keyboard above the greeter window.

Reviewed-By: Bhushan Shah

scene.cpp

@@ -609,7 +609,7 @@ void Scene::finalPaintWindow(EffectWindowImpl* w, int mask, QRegion region, Wind
 // will be eventually called from drawWindow()
 void Scene::finalDrawWindow(EffectWindowImpl* w, int mask, QRegion region, WindowPaintData& data)
 {
-    if (waylandServer() && waylandServer()->isScreenLocked() && !w->window()->isLockScreen()) {
+    if (waylandServer() && waylandServer()->isScreenLocked() && !w->window()->isLockScreen() && !w->window()->isInputMethod()) {
         return;
     }
     w->sceneWindow()->performPaint(mask, region, data);