Improve colorful lock icon for system tray (#9632)

* Fix #9432
* Simplify tray icon selection code
* Update all icons with latest export
* Fix MIME type icon appearance on KDE
---------
Co-authored-by: Janek Bevendorff <janek@keepassxc.org>

share/branding/scalable/keepassxc-monochrome-dark.svg

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