Fix: remove explicit setting of GF_PLUGIN_DIR #295

Job	Run time
bats-testsuite / cli-tests (ps5.7)	4m 50s
bats-testsuite / cli-tests (ps8)	5m 3s
bats-testsuite / cli-tests (ms8.0)	7m 19s
bats-testsuite / cli-tests (pdpgsql13)	4m 48s
bats-testsuite / cli-tests (pdpgsql14)	5m 11s
bats-testsuite / cli-tests (pdpgsql15)	4m 52s
bats-testsuite / cli-tests (modb4.4)	4m 22s
bats-testsuite / cli-tests (modb5)	5m 14s
bats-testsuite / cli-tests (modb6)	4m 23s
bats-testsuite / cli-tests (help)	4m 47s
bats-testsuite / cli-tests (generic)	5m 29s
bats-testsuite / cli-tests (clientContainer)	7m 16s
bats-testsuite / cli-tests (haproxy)	8m 26s
bats-testsuite / cli-tests (proxysql)	7m 22s
bats-testsuite / cli-tests (remove)	5m 39s
	1h 25m 1s

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