Fix minor syntax issues

classes/check/failingtaskcheck.php

@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 namespace tool_heartbeat\check;
+
 use core\check\check;
 use core\check\result;
 
@@ -39,7 +40,6 @@ class failingtaskcheck extends check {
     /** @var \stdClass $task Record of task that is failing **/
     private $task;
 
-
     /**
      * Constructor
      */
@@ -123,7 +123,7 @@ public function get_ref(): string {
      * @return array of failing tasks
      */
     public static function get_failing_tasks(): array {
-        global $DB,
+        global $DB;
         $tasks = [];
 
         // Instead of using task API here, we read directly from the database.