Bluetooth: Conroller: radio: Clear EVENTS_CTEPRESENT always if DF supp

The EVENTS_CTEPRESENT is available when radio peripheral has
direction finding support. The event is set if received
PDU has CTEInfo and there were collected IQ samples during
CTE reception.

The event should be cleared always when other events are cleared.
That guarantees that the event is not set when use of radio for
following activities.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>