Pick the right pubkey on zaps with multiple p-tags

[jb55]

It looks like some zappers are incorrectly adding more than one p-tag to a zap. They should be using P tags instead.

One thing we can do to detect the correct p-tag is to look at the pubkey on the zap request, and use the p-tag that is not the zap request pubkey.

[alltheseas]

if there is p-tag and e-tag : note zap
of only p-tag : profile zap

some zappers attaching p-tag incorrectly (zap came from this person)
has to find correct p tag - only way to do this is look at zap requests - exclude this p tag, and then send notification

upper case P tag : "this is person who sent the zap"

proposed solution:

zap request is in the zap note. when fetch zap note, put within invoice. zapper puts zap in tag. signed note from person who initiated zap. zap note.

Daniel: is zap spec defining two events?
W: zap events come packaged in note.

@jb55 to tackle