Remove grecaptcha check when setting recaptcha submit callback

[jimchamp]

Closes #

Technical

Testing

Screenshot

Stakeholders

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 17.29%. Comparing base (606faaf) to head (ae96a31).
Report is 422 commits behind head on master.

Files with missing lines	Patch %	Lines
openlibrary/plugins/openlibrary/js/signup.js	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10477      +/-   ##
==========================================
- Coverage   17.31%   17.29%   -0.02%     
==========================================
  Files          87       87              
  Lines        4835     4839       +4     
  Branches      856      858       +2     
==========================================
  Hits          837      837              
- Misses       3471     3473       +2     
- Partials      527      529       +2     

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[cdrini]

Tested on testing, and worked as expected.