Windows: only one instance should be allowed per user

[XhmikosR]

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Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Clock on backrest-windows-tray.exe
2. Click again on backrest-windows-tray
3. Notice the two different instances

Expected behavior Only one instance should be allowed at a time

Screenshots If applicable, add screenshots to help explain your problem.

Platform Info

• Windows 11
• 1.9.2

Additional context Add any other context about the problem here.

[wolrah]

I think this should be slightly adjusted to "only one instance should be allowed at a time PER USER" as where there are multiple users on a system (shared family computer, terminal server, etc.) and/or perhaps a system-level install it should still be possible for each user to operate their own instance independent of the others.