IDE-184 Fix Stitching Trace vanishing with MAXIMIZED screen (Catrobat…

…#4850)

Problem was: Screenshotheight/width was not properly initialized in
all cases. - This caused the projection matrix to be 0, thus causing
the stitching patterns to disappear.

Moved initialization out of the switch s.t. it occurs in all cases.

Co-authored-by: Max Oberaigner <contact+catrobat@oberaigner.info>

catroid/src/main/java/org/catrobat/catroid/stage/StageListener.java

@@ -1,6 +1,6 @@
 /*
  * Catroid: An on-device visual programming system for Android devices
- * Copyright (C) 2010-2022 The Catrobat Team
+ * Copyright (C) 2010-2023 The Catrobat Team
  * (<http://developer.catrobat.org/credits>)
  *
  * This program is free software: you can redistribute it and/or modify
@@ -727,10 +727,11 @@ public void clearBackground() {
 	}
 
 	private void initScreenMode() {
+		screenshotWidth = ScreenValues.getScreenWidthForProject(project);
+		screenshotHeight = ScreenValues.getScreenHeightForProject(project);
+
 		switch (project.getScreenMode()) {
 			case STRETCH:
-				screenshotWidth = ScreenValues.getScreenWidthForProject(project);
-				screenshotHeight = ScreenValues.getScreenHeightForProject(project);
 				screenshotX = 0;
 				screenshotY = 0;
 				viewPort = new ScalingViewport(Scaling.stretch, virtualWidth, virtualHeight, camera);