Doesn't matter. Berdych won the replayed point.
But Andy would have won te point the cap didn't fall(assuming Berdych wouldn't have got the dropshot). It wouldn't have mattered had Murray won the point anyway, but since Berdych did and broke back it does.
The right call was made, sucks for Murray sure, he probably would have won the point but it's his cap, and his job to keep it on his head, he didn't and by rule it should and was replyed