Force preview to always appear in front of image display

Author: Chrezm

objects/objPreview/Create_0.gml

@@ -6,4 +6,5 @@ foreground_sprite = -1;
 selected_sprite = -1;
 preview_size = objButtonGenerator.target_size;
 preview_surface = -1;
-mask_surface = -1;
+mask_surface = -1;
+depth = objImageDisplay.depth-1;