Reduces the number of skulls spawned by crystal legion by 1 #17116

Job	Run time
Windows Build	5m 14s
Run Linters	2m 56s
Compile Maps	43s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 21s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	2m 38s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	4m 47s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	4m 5s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	9m 16s
	33m 0s

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