Fix #1554: Center Play/Pause Button

[ajkapala21]

Fixes #1544
Adds a right margin of 4px to the player button class which successfully centers each icon (pause, play, or loading). Although a previous comment highlighted that each icon was off center by a varying amount, from my inspection they are all off by the same amount, so the same margin can be applied to all of them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.05%. Comparing base (3764ff6) to head (7bf5b5f).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1589   +/-   ##
=======================================
  Coverage   72.05%   72.05%           
=======================================
  Files         362      362           
  Lines        6746     6746           
  Branches      498      498           
=======================================
  Hits         4861     4861           
  Misses       1478     1478           
  Partials      407      407           

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[nukeop]

Nice, thank you.