MDL-81456 core: Correct namespace imports

mod/quiz/classes/grade_calculator.php

@@ -17,10 +17,8 @@
 namespace mod_quiz;
 
 use coding_exception;
-use core\{
-    di,
-    hook,
-};
+use core\di;
+use core\hook;
 use mod_quiz\event\quiz_grade_updated;
 use mod_quiz\hook\structure_modified;
 use question_engine_data_mapper;

mod/quiz/classes/quiz_attempt.php

@@ -21,10 +21,8 @@ use block_contents;
 use cm_info;
 use coding_exception;
 use context_module;
-use core\{
-    di,
-    hook,
-};
+use core\di;
+use core\hook;
 use Exception;
 use html_writer;
 use mod_quiz\hook\attempt_state_changed;

mod/quiz/locallib.php

@@ -35,10 +35,8 @@ require_once($CFG->libdir . '/completionlib.php');
 require_once($CFG->libdir . '/filelib.php');
 require_once($CFG->libdir . '/questionlib.php');
 
-use core\{
-    di,
-    hook,
-};
+use core\di;
+use core\hook;
 use core_question\local\bank\condition;
 use mod_quiz\access_manager;
 use mod_quiz\event\attempt_submitted;