Fix timing points being blocked by buttons in the editor

[SchiavoAnto]

Would fix #29761.

[bdach]

Sound idea but pretty terrible execution. The map background shouldn't be peering behind the buttons like it currently is.

If you can figure out how to give that a background that matches the pieces around it then I think we have something we can ship. Not sure what background colour to give it, maybe try something like Background2 from OverlayColourProvider.

[bdach]

as above

[SchiavoAnto]

I successfully added a background color, Background2 as you suggested. Tried Background6 too to be similar to the settings section on the right but thought it looked better with the one you suggested.
Let me know if there are other things to change.

[bdach]

@SchiavoAnto I've made a few adjustments here. Please ask if something is unclear.

@peppy requesting double-check for visuals at the least:

[peppy]

Seems fine I think.