tests

fix(xonotic): use right basedir #5144

Job	Run time
test-on-debian (debian:stable, master)	4m 35s
test-on-debian (debian:stable, develop)	4m 32s
test-on-debian (debian:testing, master)	3m 43s
test-on-debian (debian:testing, develop)	5m 18s
test-on-debian (debian:unstable, master)	4m 42s
test-on-debian (debian:unstable, develop)	4m 32s
test-on-ubuntu (ubuntu:latest, master)	4m 22s
test-on-ubuntu (ubuntu:latest, develop)	4m 17s
test-on-ubuntu (ubuntu:devel, master)	4m 39s
test-on-ubuntu (ubuntu:devel, develop)	3m 53s
test-on-ubuntu (ubuntu:rolling, master)	4m 47s
test-on-ubuntu (ubuntu:rolling, develop)	3m 56s
	53m 16s

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