spells: searing brightness should not affect challenge tasks (#8427)

* spells: searing brightness should not affect challenge tasks

* fixed other incorrect group vs challenge task exclusions

* fixed /tasks/clearCompletedTodos test

didn't account for the new group task

* fixed comment omission in tasks/clearCompletedTodos

website/server/controllers/api-v3/tasks.js

@@ -896,16 +896,24 @@ api.clearCompletedTodos = {
     let user = res.locals.user;
 
     // Clear completed todos
-    // Do not delete challenges completed todos unless the task is broken
+    // Do not delete completed todos from challenges or groups, unless the task is broken
     await Tasks.Task.remove({
       userId: user._id,
       type: 'todo',
       completed: true,
-      $or: [
-        {'challenge.id': {$exists: false}},
-        {'challenge.broken': {$exists: true}},
-        {'group.id': {$exists: false}},
-        {'group.broken': {$exists: true}},
+      $and: [ // exclude challenge and group tasks
+        {
+          $or: [
+            {'challenge.id': {$exists: false}},
+            {'challenge.broken': {$exists: true}},
+          ],
+        },
+        {
+          $or: [
+            {'group.id': {$exists: false}},
+            {'group.broken': {$exists: true}},
+          ],
+        },
       ],
     }).exec();