[py] added pythonic approach of type checking in firefox/firefox_profile.py

[sandeepsuryaprasad]

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Description

In accept_untrusted_certs and assume_untrusted_cert_issuer setter methods, we are checking if the value is either True or False using membership operator, like value in [True, False], which is not a standard way of python type checking. I have changed it to use python's built-in isinstance.

Motivation and Context

Motivation for this change is to make type checking more pythonic.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1fe0628) 57.22% compared to head (1dab78e) 57.22%.

❗ Current head 1dab78e differs from pull request most recent head 99434a5. Consider uploading reports for the commit 99434a5 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #12271   +/-   ##
=======================================
  Coverage   57.22%   57.22%           
=======================================
  Files          86       86           
  Lines        5480     5480           
  Branches      226      226           
=======================================
  Hits         3136     3136           
  Misses       2118     2118           
  Partials      226      226           

Impacted Files	Coverage Δ
py/selenium/webdriver/firefox/firefox_profile.py	18.84% <0.00%> (ø)

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