feat(player): Make 'searchForTrackSelect_' private & use 'el' as parameter in function 'getIsFocusable'

[CarlosVillasenor]

Description

Minor update related to the 'spatial navigation' feature to make 'searchForTrackSelect_' private & use 'el' as parameter in function 'getIsFocusable', since in some cases there can be an issue only using 'this.el_' when the function is called.w

Specific Changes proposed

Please list the specific changes involved in this pull request.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.00%. Comparing base (21b4a52) to head (25b68fe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8697   +/-   ##
=======================================
  Coverage   83.00%   83.00%           
=======================================
  Files         120      120           
  Lines        7995     7996    +1     
  Branches     1925     1926    +1     
=======================================
+ Hits         6636     6637    +1     
  Misses       1359     1359           

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