Remove installed_paths configuration from phpcs.xml #419

Job	Run time
testsuite / testsuite-linux (8.2, highest, false)	16s
testsuite / testsuite-linux (8.3, highest, false)	15s
cs-stan / Coding Standard & Static Analysis	29s
testsuite / testsuite-linux (8.4, highest, false)	26s
testsuite / testsuite-linux (8.5, highest, false)	19s
testsuite / testsuite-linux (8.2, lowest, false)	37s
	2m 22s

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