Allows back-slot item to be rendered above head layer #53434

Job	Run time
Run Linters	2m 35s
Lint with OpenDream	36s
Compile All Maps (BETA)	43s
Unit Tests + SQL Validation (STABLE)	3m 10s
Compile All Maps (STABLE)	48s
Windows RUSTG Validation	2m 0s
Unit Tests + SQL Validation (BETA)	3m 0s
Station Tests (metastation, STABLE)	1m 41s
Station Tests (boxstation, BETA)	1m 37s
Station Tests (deltastation, STABLE)	2m 8s
Station Tests (cerestation, BETA)	2m 1s
Station Tests (metastation, BETA)	2m 6s
Station Tests (boxstation, STABLE)	1m 42s
Station Tests (emeraldstation, BETA)	2m 12s
Station Tests (emeraldstation, STABLE)	2m 0s
Station Tests (cerestation, STABLE)	1m 42s
Station Tests (deltastation, BETA)	2m 8s
	32m 9s

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