[MinAtar] Fix minatar usage

[sotetsuk]

No description provided.

[codecov]

Codecov Report

Merging #1090 (aa6f832) into main (13035bd) will increase coverage by 0.47%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1090      +/-   ##
==========================================
+ Coverage   87.57%   88.05%   +0.47%     
==========================================
  Files          55       60       +5     
  Lines        5925     5909      -16     
==========================================
+ Hits         5189     5203      +14     
+ Misses        736      706      -30     

Files	Coverage Δ
pgx/core.py	85.44% <100.00%> (+15.05%)	⬆️
pgx/minatar/asterix.py	100.00% <100.00%> (ø)
pgx/minatar/breakout.py	100.00% <100.00%> (ø)
pgx/minatar/freeway.py	100.00% <100.00%> (ø)
pgx/minatar/seaquest.py	100.00% <100.00%> (ø)
pgx/minatar/space_invaders.py	100.00% <100.00%> (ø)