Use default Solaar icon for system tray

Created by: janvlug

Information

• Solaar version (solaar --version or git describe --tags if cloned from this repository): 1.0.4
• Distribution: Fedora

Describe the bug The current icon for Solaar in the system tray is a battery. This is slightly confusing, and moreover, the regular Solaar icon looks way better. I suggest to use the standard Solaar icon as the icon for the system tray.

See also this issue.

Additional information The Top Indicator App GNOME extension has to be installed on Fedora 33 GNOME Wayland to make the icon visible.