Remove unecessary mock

Author: machadoum

x-pack/plugins/security_solution/public/timelines/components/timeline/body/index.test.tsx

@@ -27,7 +27,6 @@ import { defaultRowRenderers } from './renderers';
 
 jest.mock('../../../../common/lib/kibana/hooks');
 jest.mock('../../../../common/hooks/use_app_toasts');
-jest.mock('../../../../common/containers/source', () => ({ useIndexFields: () => ({}) }));
 jest.mock('../../../../common/lib/kibana', () => {
   const originalModule = jest.requireActual('../../../../common/lib/kibana');
   return {