Stall current for a -7 flap motor is around 14.5 amps. Peak inrush current will likely be close to that. Wire (and the breaker, which protects *the wire*) probably can be sized a bit smaller than that, since inrush is very short term, and the motor never fully stalls in normal operation. A fuse is typically faster acting and may need to be sized at or above the stall current, to avoid nuisance trips.
(Sad that supposedly reputable companies keep trying to push device protection duties out to the other end of the power wire; their engineers know better than that.)