minor icon issue

[chasd00]

I think the icons have a white border, this makes them hard to see when not in dark mode. In my taskbar, uxplay basically looks like a blank spot. Minor issue but just letting you know. I may try to fix this myself later on tonight and submit a PR.

[leapbtw]

this is something i already wanted to do and i also thought to change the icon based on uxplay.exe running or not status.

tho i would like to completely rewrite uxplay-windows in the future so i haven't worked on it yet. Feel free to PR if you want