Cleanup: Remove accidentially added constexpr qualifier

It doesn't hurt, but it doesn't really provide any benefit either
to how we use the value in the code at the moment, so I view it as
kind of misleading, since all the calls here are done at runtime.

Pull Request: https://projects.blender.org/blender/blender/pulls/122419

source/blender/editors/sculpt_paint/paint_hide.cc

@@ -192,7 +192,7 @@ enum class VisAction {
   Show = 1,
 };
 
-constexpr static bool action_to_hide(const VisAction action)
+static bool action_to_hide(const VisAction action)
 {
   return action == VisAction::Hide;
 }