Fix search in web UI not setting a limit, restore limit of 5 (#10421)

The search API now supports returning more results and pagination,
but until the web UI implements pagination, it makes no sense to
dump so many results at once. This fix restores the behaviour
before the API change

app/javascript/mastodon/actions/search.js

@@ -37,6 +37,7 @@ export function submitSearch() {
       params: {
         q: value,
         resolve: true,
+        limit: 5,
       },
     }).then(response => {
       if (response.data.accounts) {