Remove unnecessary param in SearchPage setup() (#136)

Forgot to remove this from a previous PR. This parameter isn't being used and don't want the pattern to get propagated if anyone does a copy-paste.

amundsen_application/static/js/components/SearchPage/tests/index.spec.tsx

@@ -33,7 +33,7 @@ import globalState from 'fixtures/globalState';
 describe('SearchPage', () => {
   const setStateSpy = jest.spyOn(SearchPage.prototype, 'setState');
 
-  const setup = (propOverrides?: Partial<SearchPageProps>, useMount?: boolean) => {
+  const setup = (propOverrides?: Partial<SearchPageProps>) => {
     const props: SearchPageProps = {
       searchTerm: globalState.search.search_term,
       popularTables: globalState.popularTables,