Fix strpos() warning #50

Job	Run time
ci / check if job needs to run	3s
ci / prepare test matrix	16s
ci / MOODLE_400_STABLE - pgsql - php 7.3 - mod_hvp	3m 15s
ci / MOODLE_401_STABLE - pgsql - php 7.4 - mod_hvp	3m 15s
ci / MOODLE_401_STABLE - pgsql - php 8.0 - mod_hvp	3m 41s
ci / MOODLE_401_STABLE - mariadb - php 8.0 - mod_hvp	3m 36s
ci / MOODLE_402_STABLE - pgsql - php 8.0 - mod_hvp	3m 17s
ci / MOODLE_401_STABLE - mariadb - php 7.4 - mod_hvp	3m 10s
ci / MOODLE_402_STABLE - mariadb - php 8.0 - mod_hvp	3m 26s
ci / MOODLE_402_STABLE - pgsql - php 8.1 - mod_hvp	3m 2s
ci / MOODLE_402_STABLE - mariadb - php 8.1 - mod_hvp	3m 24s
ci / MOODLE_403_STABLE - pgsql - php 8.0 - mod_hvp	3m 16s
ci / MOODLE_403_STABLE - mariadb - php 8.0 - mod_hvp	3m 1s
ci / MOODLE_403_STABLE - pgsql - php 8.2 - mod_hvp	3m 25s
ci / MOODLE_403_STABLE - mariadb - php 8.2 - mod_hvp	3m 31s
ci / MOODLE_404_STABLE - pgsql - php 8.1 - mod_hvp	3m 19s
ci / MOODLE_404_STABLE - mariadb - php 8.1 - mod_hvp	3m 21s
ci / MOODLE_404_STABLE - pgsql - php 8.3 - mod_hvp	3m 47s
ci / MOODLE_404_STABLE - mariadb - php 8.3 - mod_hvp	3m 44s
ci / Release to the Moodle plugin directory	0s
	57m 49s

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