Bug description
White application icon in tray on Plasma graphical environment.
The icon has a white light and when Plasma has a white theme, the app is almost invisible.
When you switch to a dark theme, the app icon is very visible. The icon color issue needs to be addressed.

Screenshots
If applicable, please add screenshots to explain the issue.

Desktop (please fill in the following information):.

• Operating system: [e.g. red].
• Window system in case: [e.g. X11].
• Version of ksnip: [e.g., 1.8.0].
• How you installed ksnip: [e.g., AppImage].
  I installed ksnip via Appimage and it is very convenient and good.