Address eslint errors.

src/inject/messaging/sendSimpleMessage.js

@@ -1,6 +1,6 @@
 import sendEventViaDocument from './sendEventViaDocument.js';
 
-function sendSimpleMessage(action) {
+function sendSimpleMessage (action) {
   const event = new CustomEvent(action);
   sendEventViaDocument(event);
 }