Remove Surface::flush() and use Context::flush() instead.

[domchen]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.38%. Comparing base (9995b21) to head (bb12fd7).

Files with missing lines	Patch %	Lines
src/rendering/PAGSurface.cpp	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2525      +/-   ##
==========================================
+ Coverage   77.31%   77.38%   +0.07%     
==========================================
  Files         420      420              
  Lines       22458    22457       -1     
  Branches     6312     6331      +19     
==========================================
+ Hits        17363    17379      +16     
+ Misses       3819     3816       -3     
+ Partials     1276     1262      -14     

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