fix: demo page representation selector

[adrums86]

Description

The VHS demo page representation selector was not allowing the user to select the first or 0 indexed representation in the list.

Specific Changes proposed

Remove the !selectedIndex check and change the expected index to < 0 for "no element selected". See: https://developer.mozilla.org/en-US/docs/Web/API/HTMLSelectElement/selectedIndex

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #1416 (5043a24) into main (de183c8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1416   +/-   ##
=======================================
  Coverage   85.55%   85.55%           
=======================================
  Files          41       41           
  Lines       10145    10145           
  Branches     2351     2351           
=======================================
  Hits         8680     8680           
  Misses       1465     1465           

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