Add monochrome icon

[gudvinr]

Expected Behavior

User should be able to set icon as monochrome.

Current Behavior

Currently only default purple lock icon is available.

Possible Solution

Not sure if there's a way for an app to get from OS if it wants monochrome icon so checkbox in the menu should be alright.
E.g. Telegram (also Qt app) does that.

Steps to Reproduce

Version Information

v3.10.0 (br-194)

Context (Environment)

I have dark background and ALL icons except proton bridge are monochrome (white on dark background) so it looks very off and steals attention.

Detailed Description

Possible Implementation

[pders01]

I second that, it's very annoying (Love the product, though). Please just do it, it's an easy enhancement and many will appreciate it.

[pders01]

Thanks for reporting @gudvinr

[RokeJulianLockhart]

#475 (comment)

This is especially useful for the System Tray: