remove unnessary manual focussing of composer

now that composer is focused automatically when no other shortcuts
apply, remove the manual focusing we have in place where it's not needed

src/ContentMessages.js

@@ -498,9 +498,6 @@ export default class ContentMessages {
         this.inprogress.push(upload);
         dis.dispatch({action: 'upload_started'});
 
-        // Focus the composer view
-        dis.dispatch({action: 'focus_composer'});
-
         let error;
 
         function onProgress(ev) {