BatteryIcon: Add headphone icon

Kai Uwe Broulikrequested to merge
work/kbroulik/headphone-battery-icon into master
  • BatteryIcon: Add headphone icon

Complements headset icon.

Reason for the change

We had headset icon but no headphone icon. Headphone would show a regular battery icon.

@jpetso

imho good for 6.2

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