events: inline createEvent hybrid dispatch closure

Originally added in 16b11cd2adaa5f60382a7f205f893f38a5061fff, it first
had three callers. Now there's only one branch requireing it.

Signed-off-by: Szymon Łągiewka <slagiewka@users.noreply.github.com>
PR-URL: https://github.com/nodejs/node/pull/64473
Reviewed-By: Chemi Atlow <chemi@atlow.co.il>