[Bug] sig_helper: If more than 5 minutes passed since player js fetch it will never be fetched again

[MMaster]

Condition to check if player was fetched in last 5 minutes is reversed and it will early return if more than 5 minutes passed.

https://github.com/iv-org/invidious/blob/master/src/invidious/helpers/signatures.cr#L16

[SamantazFox]

Nice catch, thanks!