Blender Git Loki

Fix T82800: Changing settings from a pie menu doesn't add undo steps

Pie menu had inconsistent behavior for dragging & releasing the key
compared to clicking on the button.

This was caused by the `onfree` argument being set to true,
preventing the button from running callbacks such as setting
up undo data & auto-keyframe

This argument should only be used when freeing the button,
set this to false as is done for regular menus.