Fix typo in install-wp-tests.sh (#272)

Author: swissspidy

bin/install-wp-tests.sh

@@ -18,7 +18,7 @@ TMPDIR=$(echo $TMPDIR | sed -e "s/\/$//")
 WP_TESTS_DIR=${WP_TESTS_DIR-$TMPDIR/wordpress-tests-lib}
 WP_TESTS_FILE="$WP_TESTS_DIR"/includes/functions.php
 WP_CORE_DIR=${WP_CORE_DIR-$TMPDIR/wordpress/}
-WP_CORE_FILE="$WP_CORE_DIR"/wp-includs.php
+WP_CORE_FILE="$WP_CORE_DIR"/wp-settings.php
 GP_TESTS_DIR="$WP_CORE_DIR/build/wp-content/plugins/glotpress/tests/phpunit"
 
 download() {