Add True => 20 in process_frame_fast

[matbryan52]

Fixes missing default parameter conversion when using upsample = True and FastCorrelation.

Contributor Checklist:

• I have added myself to the creators.json file
• I have added a changelog entry for my contribution
• I have added/updated documentation for all user-facing changes
• I have added/updated test cases

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.83%. Comparing base (208504f) to head (d7f1072).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
+ Coverage   86.81%   86.83%   +0.02%     
==========================================
  Files          14       14              
  Lines        1191     1193       +2     
  Branches      171      172       +1     
==========================================
+ Hits         1034     1036       +2     
  Misses        105      105              
  Partials       52       52              

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[sk1p]

LGTM! (before this change, the "sensible upsampling factor" for upsample=True was int(True) == 1)