cursor: More reliably clear "pressed" status of mouse bindings

cursor: More reliably clear "pressed" status of mouse bindings

The "pressed" status of the mouse button is stored per-binding, and
the first binding activated causes us to break out of the loop that
cleared the "pressed" status -- as a result, some statused weren't
cleared when another binding was activated.

The bug could be seen when clicking the maximize button on a window
and then moving the mouse: the DRAG action would continue to move
the window (unmaximizing it) even though the mouse button was no
longer held.