fix(ci): use server behat binary

Signed-off-by: grnd-alt <git@belakkaf.net>

Author: grnd-alt

tests/integration/run.sh

@@ -33,7 +33,7 @@ echo $PHPPID
 
 export TEST_SERVER_URL="http://localhost:$PORT/ocs/"
 
-vendor/bin/behat --colors --suite=test $SCENARIO_TO_RUN
+${OC_PATH}vendor-bin/behat/vendor/bin/behat --colors --suite=test $SCENARIO_TO_RUN
 RESULT=$?
 
 kill -9 $PHPPID