Update ZDefinitions to use "acc(ALL)" dummy cut

"acc(ALL)" is hardcoded as true with a weight 1, so it is the right cut
to use when you want to apply "no cut" to an electron at a certain
stage. The only thing "acc(ALL) + acc(ALL)" requires is two electrons.
Fix typo in "3 Double Trigger Cuts" ZDefinition

Change "acc(et_et_loose)" to "trig(et_et_loose)".