This PR moves back the wireframe slider option back to the bones overlay popover. It is only showed in paint weight mode and only active if in wireframe mode. It was concluded that this feature should be revisited to maybe cover all shading modes in the future. But for now it is safer for 4.5 to limit it to the weightpaint mode. Pull Request: https://projects.blender.org/blender/blender/pulls/140276