Try to fix text entry new line bug

[MyreMylar]

As title.

fixes #606

[codecov]

Codecov Report

Attention: Patch coverage is 82.92683% with 7 lines in your changes missing coverage. Please review.

Project coverage is 95.92%. Comparing base (4b79e7a) to head (f568612).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
pygame_gui/core/text/text_box_layout_row.py	84.21%	6 Missing ⚠️
pygame_gui/core/text/text_line_chunk.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #646      +/-   ##
==========================================
- Coverage   95.96%   95.92%   -0.04%     
==========================================
  Files          90       90              
  Lines       14117    14152      +35     
==========================================
+ Hits        13547    13575      +28     
- Misses        570      577       +7     

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