Restrict search in edit extractor example (Graylog2#4554)

We recently fixed an issue in the RecentMessageLoader component to
ensure the search of an example is restricted to the last hour. This
change does the same for the edit extractor page.

Fixes Graylog2#4553

graylog2-web-interface/src/pages/EditExtractorsPage.jsx

@@ -34,7 +34,7 @@ const EditExtractorsPage = React.createClass({
   componentDidMount() {
     InputsActions.get.triggerPromise(this.props.params.inputId);
     ExtractorsActions.get.triggerPromise(this.props.params.inputId, this.props.params.extractorId);
-    UniversalSearchstore.search('relative', `gl2_source_input:${this.props.params.inputId} OR gl2_source_radio_input:${this.props.params.inputId}`, { range: 0 }, undefined, 1)
+    UniversalSearchstore.search('relative', `gl2_source_input:${this.props.params.inputId} OR gl2_source_radio_input:${this.props.params.inputId}`, { relative: 3600 }, undefined, 1)
       .then((response) => {
         if (response.total_results > 0) {
           this.setState({ exampleMessage: response.messages[0] });