fix(benchmarks): remove unnecessary providers

Author: wagnermaciel

test/benchmarks/mdc/button/app.module.ts

@@ -37,7 +37,7 @@ export class ButtonBenchmarkApp {
     BrowserModule,
     MatButtonModule,
   ],
-  providers: [],
+
   bootstrap: [ButtonBenchmarkApp],
 })
 export class AppModule {}

test/benchmarks/mdc/checkbox/app.module.ts

@@ -46,7 +46,7 @@ export class CheckboxBenchmarkApp {
     BrowserModule,
     MatCheckboxModule,
   ],
-  providers: [],
+
   bootstrap: [CheckboxBenchmarkApp],
 })
 export class AppModule {}