style: fix linting issues met Prettier

backend/src/entities/classes/class-join-request.entity.ts

@@ -4,13 +4,25 @@ import { Class } from './class.entity';
 
 @Entity()
 export class ClassJoinRequest {
-    @ManyToOne({ entity: () => {return Student}, primary: true })
+    @ManyToOne({
+        entity: () => {
+            return Student;
+        },
+        primary: true,
+    })
     requester!: Student;
 
-    @ManyToOne({ entity: () => {return Class}, primary: true })
+    @ManyToOne({
+        entity: () => {
+            return Class;
+        },
+        primary: true,
+    })
     class!: Class;
 
-    @Enum(() => {return ClassJoinRequestStatus})
+    @Enum(() => {
+        return ClassJoinRequestStatus;
+    })
     status!: ClassJoinRequestStatus;
 }
 

backend/src/entities/classes/class.entity.ts

@@ -17,9 +17,13 @@ export class Class {
     @Property({ type: 'string' })
     displayName!: string;
 
-    @ManyToMany(() => {return Teacher})
+    @ManyToMany(() => {
+        return Teacher;
+    })
     teachers!: Collection<Teacher>;
 
-    @ManyToMany(() => {return Student})
+    @ManyToMany(() => {
+        return Student;
+    })
     students!: Collection<Student>;
 }

backend/src/entities/classes/teacher-invitation.entity.ts

@@ -7,12 +7,27 @@ import { Class } from './class.entity.js';
  */
 @Entity()
 export class TeacherInvitation {
-    @ManyToOne({ entity: () => {return Teacher}, primary: true })
+    @ManyToOne({
+        entity: () => {
+            return Teacher;
+        },
+        primary: true,
+    })
     sender!: Teacher;
 
-    @ManyToOne({ entity: () => {return Teacher}, primary: true })
+    @ManyToOne({
+        entity: () => {
+            return Teacher;
+        },
+        primary: true,
+    })
     receiver!: Teacher;
 
-    @ManyToOne({ entity: () => {return Class}, primary: true })
+    @ManyToOne({
+        entity: () => {
+            return Class;
+        },
+        primary: true,
+    })
     class!: Class;
 }