fix #194: use formfield_callback to assume HTTPS scheme

[M3nace]

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name: Pull request
about: Submit a pull request for this project
assignees: fabiocaccamo

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Describe your changes
In SettingForm's Meta class, use the "formfield_callback" to apply the "assume_scheme" option on potential URLField.

Related issue
#194

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.51%. Comparing base (2c20097) to head (25ceaeb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
+ Coverage   85.31%   85.51%   +0.20%     
==========================================
  Files          21       21              
  Lines         429      435       +6     
==========================================
+ Hits          366      372       +6     
  Misses         63       63              

Flag	Coverage Δ
unittests	85.51% <100.00%> (+0.20%)	⬆️

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