fix(statebag): only try to erase if the key existed before

[AvarianKnight]

Since we would always check for the Nil value at the start of the if chain we would always send this to the server or client.

This changes the behavior to only erase if the key existed in the first place, and if it didn't then we will just do an early return so we don't replicate the data (and possibly hit the rate limiter).

Goal of this PR

Reduce the amount of packets sent to the server whenever the state bag doesn't already exist

How is this PR achieving the goal

Fix the checks to take into account that the key could not exist

This PR applies to the following area(s)

FiveM, RedM, Server

Successfully tested on

Game builds: ..

Platforms: Windows, Linux

Checklist

This hasn't been tested

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

Fixes an oversight in PR #2717