[Bug 1871644]

[B-emilio]

Created attachment 9246291
Bug 1509931 - Simplify titlebar buttons CSS. r=stransky


There's no need to use the media query to set the default styles of the
buttons, we only need to hide them if appropriate.

Depends on D128682

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Title:
  Top corners of Firefox windows have weird black protrusions from the
  rounded edges

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