Blender Git Loki

Fix T78428: Checkbox labels don't highlight on mouse-over in popovers

The text colors set by the general widget state function
(`widget_state()`) would always be overriden by the menu-back text
colors to avoid contrast issues. This would only respect the selected
state, not other states.

Address this now by changing the input theme colors to use the menu-back
ones, rather than overriding after the fact (calling `widget_state()`).