Refresh Theme With DBus

[Zren]

This seems to spend less time in the transistion. breeze-light doesn't even flicker. It still takes a second for it to load the modified alphablack svgs but the transition now makes the difference more obvious.

• [x] Call qdbus org.kde.plasmashell /PlasmaShell evaluateScript "theme='breeze-light';theme='breeze-alphablack'"
• [ ] Confirm ~/.config/plasmarc is set to breeze-alphablack if we weren't on breeze-alphablack when we started the change.
• [ ] Confirm this method works with latte-dock. If not, write another dbus command?

Also, I should look into recommending opening the AlphaBlack Control widget as a windowed widget with plasmawindowed com.github.zren.alphablackcontrol since the system tray widget required restarting plasmashell before it loads.