FIX: Remove BrowserWarning check for web based validator

[nellh]

The features previously unavailable that required the BrowserWarning are now available and generally compatible across browsers. I think we should remove this check to solve the issue in #1803.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -2.02% ⚠️

Comparison is base (ef044b6) 85.61% compared to head (3869f0d) 83.59%.

❗ Current head 3869f0d differs from pull request most recent head 8cf2a6a. Consider uploading reports for the commit 8cf2a6a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1804      +/-   ##
==========================================
- Coverage   85.61%   83.59%   -2.02%     
==========================================
  Files         131       92      -39     
  Lines        6637     3895    -2742     
  Branches     1536     1272     -264     
==========================================
- Hits         5682     3256    -2426     
+ Misses        847      541     -306     
+ Partials      108       98      -10     

see 39 files with indirect coverage changes

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