chore: adjust when we log warn for gift notification

[capJavert]

Split condition because warn was firing for each user subscription purchase thus spamming a bit too much

We now:

• early return when user is not gifted, basic case where user bought subscription for themself
• warn if user was gifter but was already gifter id is missing

[capJavert]

@ilasw for sanity check, logic is the same it was just spamming warns too much.