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/components/cards/minicard.jade

@@ -3,13 +3,9 @@ template(name="minicard")
     class="{{#if isLinkedCard}}linked-card{{/if}}"
     class="{{#if isLinkedBoard}}linked-board{{/if}}"
     class="minicard-{{colorClass}}")
-    if isMiniScreen
+    if isMiniScreenOrShowDesktopDragHandles
       .handle
         .fa.fa-arrows
-    unless isMiniScreen
-      if showDesktopDragHandles
-        .handle
-          .fa.fa-arrows
     if cover
       .minicard-cover(style="background-image: url('{{cover.url}}');")
     if labels

client/components/cards/minicard.js

@@ -75,16 +75,6 @@ BlazeComponent.extendComponent({
 }).register('minicard');
 
 Template.minicard.helpers({
-  showDesktopDragHandles() {
-    currentUser = Meteor.user();
-    if (currentUser) {
-      return (currentUser.profile || {}).showDesktopDragHandles;
-    } else if (window.localStorage.getItem('showDesktopDragHandles')) {
-      return true;
-    } else {
-      return false;
-    }
-  },
   hiddenMinicardLabelText() {
     currentUser = Meteor.user();
     if (currentUser) {