D5144: Change the volume icon/mute button into a ToolButton

[Chris Holland]

Zren added a comment.


  Before tackling the implicitWidth/height stuff, I noticed that my microphone's Heading label was getting moved on the first click. Adding `height: contextMenuButton.height` fixes it but that doesn't feel right.
  
  https://streamable.com/07hc0

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D5144

To: Zren, #plasma, subdiff, drosca
Cc: subdiff, drosca, plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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