fix(server/state): update last occupant for given seat index even if was taken

[drakeee]

Goal of this PR

There are a lot of seat ejection happening. Cheater able to force out already seated players in given vehicles. The problem is that GetLastPedInVehicleSeat wouldn't return the cheater ped, because there is an if check if the seat is free and won't modify the last occupant array for the vehicle.

How is this PR achieving the goal

Current occupants for the vehicle would be the same, last occupants skip the if check.

This PR applies to the following area(s)

Server

Successfully tested on

Game builds: 3258
Platforms: Windows

Checklist

• 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