fix(form): Update placeholder language in location field to reflect new mouse/tap interaction

Refs ibi-group/trimet-mod-otp#131

Author: David Emory

lib/components/form/default-search-form.js

@@ -26,7 +26,7 @@ export default class DefaultSearchForm extends Component {
 
   render () {
     const { icons, mobile } = this.props
-    const actionText = mobile ? 'long press' : 'right-click'
+    const actionText = mobile ? 'tap' : 'click'
 
     return (
       <div>