Make sure season parameter is a string for get_all_episodes(). Fixes …

[medariox]

…#3661

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[codecov-io]

Codecov Report

Merging #3664 into develop will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff            @@
##           develop    #3664   +/-   ##
========================================
  Coverage    28.94%   28.94%           
========================================
  Files          275      275           
  Lines        34928    34928           
========================================
  Hits         10110    10110           
  Misses       24818    24818

Impacted Files	Coverage Δ
medusa/tv/series.py	20.25% <ø> (ø)	⬆️
medusa/server/web/home/handler.py	10.83% <0%> (ø)	⬆️

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