core: bring original volume panel expand icon back

This one makes more sense from a UX standpoint

Conflicts:
	core/res/res/drawable-hdpi/ic_sysbar_quicksettings.png
	core/res/res/drawable-mdpi/ic_sysbar_quicksettings.png
	core/res/res/drawable-xhdpi/ic_sysbar_quicksettings.png
	core/res/res/drawable-xxhdpi/ic_sysbar_quicksettings.png
Update the color of the expandable volume panel icon

This still retains the old settings icon since it
happens to fit perfectly. Pressing it does indeed
show you a bunch of sliders like the icon indicates.

Also add xhdpi and xxhdpi versions.

Conflicts:
	core/res/res/drawable-hdpi/ic_sysbar_quicksettings.png
	core/res/res/drawable-mdpi/ic_sysbar_quicksettings.png