Snapping menu buttons should be interactable, regardless of snapping being enabled

[dunity]

Currently the snapping menu buttons aren't interactable if snapping is disabled. They should allow for interaction, regardless of the setting being enabled. Otherwise, currently, the user is left trying to click these buttons, and nothing is reflected visually (a tooltip message could inform the user of such a ux state). This can give the appearance of a broken button. Either we allow for the buttons to be interactable regardless, as is the standard Unity UX convention (you can still change component settings on a disabled component), or we automatically enable snapping is one of the snapping menu buttons is interacted with.