Fix isVideoEnabled function

[Ivansss]

• Fix Show avatar placeholders for people who have no webcam, instead of showing videoContainer #277
• Fix Avatar does not show if you disable your camera before joining a room #178

[codecov]

Codecov Report

Merging #312 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #312   +/-   ##
=========================================
  Coverage     15.46%   15.46%           
  Complexity      274      274           
=========================================
  Files            18       18           
  Lines          1293     1293           
=========================================
  Hits            200      200           
  Misses         1093     1093

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[jancborchardt]

Awesome stuff @Ivansss, looks really nice with the guest avatar fixes too! :)