fix: change the scooter position in res_backyard_scooter

[0Monet]

Checklist

Required

• I wrote the PR title in conventional commit format.
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Purpose of change

because the scooter and its tarpaulin are placed outside the nested mapgen boundary.

Describe the solution

I changed the position of the scooter and the tarpaulin.

Describe alternatives you've considered

none

Additional context

Before:

After: