fix(mdc-form-field-benchmark): remove unnecessary provider

Author: wagnermaciel

test/benchmarks/mdc/form-field/app.module.ts

@@ -55,7 +55,6 @@ export class FormFieldBenchmarkApp {
     MatFormFieldModule,
     MatInputModule,
   ],
-  providers: [],
   bootstrap: [FormFieldBenchmarkApp],
 })
 export class AppModule {}