Merge pull request #656 from gbbofh/fix-label-rect

Fix: Replace 'relative_rect' with 'rel_rect' in UILabel.__init__

pygame_gui/elements/ui_label.py

@@ -64,7 +64,7 @@ def __init__(self, relative_rect: Union[RectLike, Coordinate],
                          object_id=object_id,
                          element_id=['label'])
 
-        self.dynamic_dimensions_orig_top_left = relative_rect.topleft
+        self.dynamic_dimensions_orig_top_left = rel_rect.topleft
 
         self.text = text
         self.text_kwargs = {}