Fix syntax issues in auth.guard.ts

Corrected spacing around type annotation and added missing semicolon in the `canActivate` method. These changes ensure better code consistency and adhere to TypeScript style guidelines.

apps/backend/src/app/auth/auth.guard.ts

@@ -96,7 +96,7 @@ export class InsertAdminState implements CanActivate {
 		@Inject(DbService) private readonly databaseService: DbService,
 	) {}
 	async canActivate(context: ExecutionContext): Promise<boolean> {
-		const request : Request = context.switchToHttp().getRequest();
+		const request: Request = context.switchToHttp().getRequest();
 
 		const authHeader = request.headers.authorization;
 		if (!authHeader) {
@@ -120,8 +120,8 @@ export class InsertAdminState implements CanActivate {
 			return true;
 		}
 
-		request.headers.is_admin = true
+		request.headers.is_admin = true;
 
 		return true;
 	}
-}
+}