Fix broken opfor links #13645

Job	Run time
Start Gate	1s
Collect data for other tasks	13s
Run Linters	2m 41s
Compile Maps	2m 32s
Windows Build	2m 6s
Integration Tests (blueshift) / run_integration_tests	14m 5s
Integration Tests (boxstation) / run_integration_tests	13m 11s
Integration Tests (deltastation) / run_integration_tests	13m 53s
Integration Tests (graveyard) / run_integration_tests	12m 17s
Integration Tests (icebox) / run_integration_tests	13m 58s
Integration Tests (kilostation) / run_integration_tests	13m 27s
Integration Tests (metastation) / run_integration_tests	13m 21s
Integration Tests (multiz_debug) / run_integration_tests	13m 38s
Integration Tests (ouroboros) / run_integration_tests	13m 18s
Integration Tests (runtimestation) / run_integration_tests	11m 51s
Integration Tests (theseus) / run_integration_tests	13m 57s
Integration Tests (tramstation) / run_integration_tests	14m 3s
Integration Tests (voidraptor) / run_integration_tests	17m 46s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	12m 27s
Compare Screenshot Tests	0s
Completion Gate	2s
	3h 18m 47s

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