kcm/speakertest: Improve visuals

Ismael Asensiorequested to merge
work/iasensio/speakertest-looks into master

Visual improvement that was brought up in the @teams/vdg group:

  • add icons over text, improve sizes and padding
  • add an instructional text below ("click on the speakers to test sound")
  • provide feedback when a sound is playing
  • rotate the speaker icons towards the user avatar
BEFORE AFTER
Stereo patest_before_stereo patest_after_stereo
5.1 System patest_before_51 patest_afeter_51
Edited by Ismael Asensio

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