fix: ui-background not setting the region rect and not hiding display:none

[leanmendoza]

• fix: ui-background not setting the region
• fix: not hiding display:none
• use Headers object in the fetch response

[codecov-commenter]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (c249172) 48.33% compared to head (47c0f48) 48.36%.

Files	Patch %	Lines
...d-godot-lib/src/godot_classes/dcl_ui_background.rs	9.52%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
+ Coverage   48.33%   48.36%   +0.02%     
==========================================
  Files         141      141              
  Lines       17161    17169       +8     
==========================================
+ Hits         8294     8303       +9     
+ Misses       8867     8866       -1     

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