Fix corner case missed in !1461
It was pointed out that https://gracedb-playground.ligo.org/events/E1942207/view/ did not have the correct behavior, being a search='SubGRBTargeted'
event that should have had an EM_COINC
label. However the logic in !1461 (merged) blocked this, but only should have blocked this if this was a search='SubGRBTargeted'
AND had a NOT_GRB
label.