Simplify IsFlag check logic

[skmcgrail]

Issues:

Resolves P194739376

Description of changes:

There was some logically dead code that was unnecessary and would never be reached.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.07%. Comparing base (ead47e8) to head (c32472e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2209      +/-   ##
==========================================
+ Coverage   79.04%   79.07%   +0.03%     
==========================================
  Files         612      612              
  Lines      106222   106222              
  Branches    15008    15008              
==========================================
+ Hits        83959    83992      +33     
+ Misses      21612    21579      -33     
  Partials      651      651              

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