fix atari_bcq

[Trinkle23897]

#263 (comment)

[codecov-commenter]

Codecov Report

Merging #345 (54f7fea) into master (a57503c) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
- Coverage   94.22%   94.19%   -0.03%     
==========================================
  Files          52       52              
  Lines        3362     3362              
==========================================
- Hits         3168     3167       -1     
- Misses        194      195       +1     

Flag	Coverage Δ
unittests	94.19% <ø> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
tianshou/policy/imitation/discrete_bcq.py	98.24% <ø> (ø)
tianshou/trainer/onpolicy.py	95.58% <0.00%> (-1.48%)	⬇️

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