project settings type does not match what is added

[indubitablement2]

Godot version:
Godot_v3.3-rc9_win64

Tested on Godot_v3.2.3-stable_win64 without issue.

Issue description:
When adding new project setting, type name does not always match what is added. For example, adding an array will add a dictionary.

Steps to reproduce:

[akien-mga]

That's very likely a regression from #42616, which removes two entries from the list but doesn't handle the code which then actually creates those Variant types (most likely by assuming that their OptionButton index matches their Variant index).

[Xrayez]

I think there are many such assumptions throughout Godot editor. A warning in the project settings should suffice.