Fix overflow

[ppizarror]

• Fix overflow rounding issues.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (faf29b3) 97.23% compared to head (49022b2) 97.23%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #459   +/-   ##
=======================================
  Coverage   97.23%   97.23%           
=======================================
  Files          49       49           
  Lines       12421    12423    +2     
=======================================
+ Hits        12078    12080    +2     
  Misses        343      343           

Impacted Files	Coverage Δ
pygame_menu/baseimage.py	100.00% <ø> (ø)
pygame_menu/menu.py	96.67% <100.00%> (+<0.01%)	⬆️
pygame_menu/version.py	100.00% <100.00%> (ø)

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