ButtonRebindsFilter: Set cursor position when rebinding tablet events

Since the tablet cursor and the mouse cursor is tracked separately, rebinding a tablet button to a mouse click is sort of wonky. For example, if you assign it to Right Click and attempt to open a context menu it will appear to open in the wrong place.

So before we send the mouse button event, set the mouse position to the tablet cursor position.

Blocked on

• !6149 (merged) for places to add the relevant tests