fix(language-service): add closing quote in invalid test template (#32785)

Fixes an invalid TypeScript code in the language service tests. I must
have missed this while reviewing previously; sorry about that!

PR Close #32785

packages/language-service/test/typescript_host_spec.ts

@@ -130,7 +130,7 @@ describe('TypeScriptServiceHost', () => {
       import {Component} from '@angular/core';
 
       @Component({
-        template: '<div>Hello</div>
+        template: '<div>Hello</div>',
       })
       export class HelloComponent {}
     `);