Mesh faces have a separate theme color for selected dots (1px dot in the center of the face),
in both the 3D Viewport and the Image Editor.
I don't think there is any justification for why that 1 pixel has to be a different color from rest
of the active face. Even if result isn't satisfying, we should be tweaking Face Selected color
for this purpose. 1 pixel doesn't deserve its own theme setting.
This PR removes property from both editors, and instead uses "Face Selected" color with alpha
hardcoded to 1 (removed properties didn't have alpha). Also note that dot is still visible in 3D viewport
because Face Selected color is different from Face Mode Selected color, which is used for faces
when dots are drawn.
There are no visual changes in default themes.
Pull Request: https://projects.blender.org/blender/blender/pulls/145364
e0392599f8