fix: temp way to update default scene spawn points in the loader ui

[mozhoku]

Description

Temporary fix requested by @xmfcx . This PR updates the Loader UI spawn coordinates to the selected scenes coordinates. These points are Scene name specific and updated by hand in the MapManager.cs script as for now.

• I did not update the documentation in the Parking Area documentation since it is a temporary fix.

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Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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