Fix auto resizing container

[MyreMylar]

Some fixes to handle dynamic shaped buttons and labels interacting with the auto-resizing container.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 96.23%. Comparing base (9b047ab) to head (486ee3b).

Files	Patch %	Lines
pygame_gui/core/ui_element.py	25.00%	3 Missing ⚠️
...ore/drawable_shapes/rounded_rect_drawable_shape.py	96.49%	2 Missing ⚠️
...gui/core/drawable_shapes/ellipse_drawable_shape.py	97.56%	1 Missing ⚠️
pygame_gui/elements/ui_button.py	66.66%	1 Missing ⚠️
pygame_gui/elements/ui_label.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
- Coverage   96.29%   96.23%   -0.06%     
==========================================
  Files          87       87              
  Lines       12400    12416      +16     
==========================================
+ Hits        11941    11949       +8     
- Misses        459      467       +8     

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