Adds the Cobra-20 as a buyable gun in the cargo market. (and fixes th… #14416

Job	Run time
Compile Maps	1m 21s
Run Linters	2m 22s
Windows Build	2m 29s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 9s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	2m 52s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	5m 50s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	14m 12s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	5m 5s
	37m 20s

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