isMiniScreen and showDesktopDragHandles centralized in class Utils

- a lot of same code everywhere in many files, this is against the
  concept "don't repeat yourself"

client/lib/utils.js

@@ -248,6 +248,8 @@ Utils = {
     const currentUser = Meteor.user();
     if (currentUser) {
       return (currentUser.profile || {}).showDesktopDragHandles;
+    } else if (window.localStorage.getItem('showDesktopDragHandles')) {
+      return true;
     } else {
       return false;
     }