fix: get passenger now works for vehicles with multiple boardable parts on one tile

[WishDuck]

Purpose of change (The Why)

In #8165 get_passenger was used
It broke on racing canoes
Determined issue was get_passenger when there is more then one boardable part on one tile

Describe the solution (The How)

Check all boardable parts for a passenger on the tile

Describe alternatives you've considered

Determine all bugs this may also fix

Testing

Racing canoe works again

Additional context

I screm

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.