Fixes the call to the hospital server event

[sjdawson]

Fixes #293, fixes #455

Also fixes qb-ambulancejob/308

Sat and traced this back to it incorrectly trying to call a server event with a client method. This will now update the players armor metadata value correctly when they first use armor.

Questions (please complete the following information):

• Have you personally loaded this code into an updated qbcore project and checked all it's functionality? Yes
• Does your code fit the style guidelines? Yes
• Does your PR fit the contribution guidelines? Yes

[Z3rio]

If this has really been tested ingame, and it works (with the metadata), then it looks good to me.
I was just personally unsure whether the source value really gets added to the hospital:server:SetArmor event when triggered from another server event.
(Aka, going client -> server -> server)