EV_SET() for EV_ADD used a specific filter type, but that same filter
type was not provided to the matching EV_DELETE case. This resulted in
the kernel rejecting the deletion with "Invalid argument". Fix this by
setting the same filter type for both operations.
Fixes: f9982b321222 ("Implement kqueue(2) support via CONFIG_ELOOP_KQUEUE")
Signed-off-by: Jouni Malinen <j@w1.fi>