Add an option to not dim the dot when the dock is hidded

[hbcarlos]

Thank you soo much for creating this amazing extension!

If possible, I would love to have an option in the settings panel to always keep the blue icon with the three dots and not dim the icon. My problem is that I use dark themes everywhere, and most of the time I lose the dot on the screen. Another undesired situation is when connecting/disconnecting screens, the dock move to another position since the coordinates come from the top left of the screen, and sometimes the dot ends on top of a dark background making it really hard to find.

https://user-images.githubusercontent.com/26092748/141263023-de8dd736-9e0a-4738-a882-7905b64ce4c9.mp4