Clipboard storing/monitoring is quietly re-enabled when restarting CopyQ

**Describe the bug**
May or may not be a bug: The Clipboard Storing option is always enabled when launching the program despite Clipboard Storing previously being in a disabled state on quit.

**To Reproduce**
Steps to reproduce the behavior:
1. Disable Clipboard Storing.
2. Quit CopyQ.
3. Run CopyQ.
4. Clipboard Storing is enabled.

**Expected behavior**
Remember Clipboard Storing state across CopyQ sessions.

**Version, OS and Environment**
- CopyQ 6.4.0
- Windows 11 Pro 10.0.22621

**Additional context**
I can understand that in the majority of cases one would want their clipboard manager program to be functional upon running it, but I think if someone has explicitly decided to disable Clipboard Storing, they wouldn't expect it to be automatically re-enabled next run. They would also likely realise why it isn't working and go to re-enable Clipboard Storing.

To help with avoiding "why isn't copyq working??" issues, perhaps the tray and window title's icon colour could change on Clipboard Storing disabled? E.g.:  or  ([256x256 PNGs (ZIP)](https://github.com/hluk/CopyQ/files/10611473/copyq-clipboard-storing-disabled-icons.zip) if you're interested in them). This UI improvement might be nice regardless if the main issue is considered worth changing or not.