PLT-7368: Don't clear search box on ESC in Chrome. (#7215)

webapp/components/suggestion/suggestion_box.jsx

@@ -323,6 +323,7 @@ export default class SuggestionBox extends React.Component {
                 e.preventDefault();
             } else if (e.which === KeyCodes.ESCAPE) {
                 GlobalActions.emitClearSuggestions(this.suggestionId);
+                e.preventDefault();
                 e.stopPropagation();
             } else if (this.props.onKeyDown) {
                 this.props.onKeyDown(e);