fix(play-toggle): missing svg play icon

[amtins]

Description

This PR fixes #8336, where the svg play icon is missing when player is initialized with class vjs-has-started.

Specific Changes proposed

• add setIcon to the play-toggle component constructor

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #8337 (9e49bce) into main (2b0df25) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #8337   +/-   ##
=======================================
  Coverage   82.68%   82.68%           
=======================================
  Files         113      113           
  Lines        7561     7562    +1     
  Branches     1818     1818           
=======================================
+ Hits         6252     6253    +1     
  Misses       1309     1309           

Impacted Files	Coverage Δ
src/js/control-bar/play-toggle.js	86.48% <100.00%> (+0.37%)	⬆️

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