Release 36f58b4

Update tileset source handling in map.gd

- Changed tileset_source from 0 to 1 to improve configuration.
- Added verification for tileset source existence in _ready() function to enhance error handling.
- Simplified set_tile and sync_tile functions by removing redundant error checks, ensuring smoother tile setting operations.
- Improved comments for better clarity on tileset source management and error handling.