Fix game viewport size to not include DPI scale (screen-space uses it)

#2976

Source/Engine/Engine/Screen.h

@@ -30,7 +30,7 @@ DECLARE_SCRIPTING_TYPE_NO_SPAWN(Screen);
     API_PROPERTY() static void SetIsFullscreen(bool value);
 
     /// <summary>
-    /// Gets the window size.
+    /// Gets the window size (in screen-space, includes DPI scale).
     /// </summary>
     /// <returns>The value</returns>
     API_PROPERTY() static Float2 GetSize();
@@ -50,7 +50,7 @@ DECLARE_SCRIPTING_TYPE_NO_SPAWN(Screen);
     API_FUNCTION() static Float2 GameViewportToScreen(const Float2& viewportPos);
 
     /// <summary>
-    /// Sets the window size.
+    /// Sets the window size (in screen-space, includes DPI scale).
     /// </summary>
     /// <remarks>
     /// Resizing may not happen immediately. It will be performed before next frame rendering.