Use Popup.back() instead of Popup.close() to get no conflicts if a Popup is opened as "Sub Popup"

- .back() is also .close() if there is no "popup layer" left

client/components/users/userHeader.js

@@ -34,10 +34,10 @@ Template.memberMenuPopup.helpers({
 
 Template.memberMenuPopup.events({
   'click .js-my-cards'() {
-    Popup.close();
+    Popup.back();
   },
   'click .js-due-cards'() {
-    Popup.close();
+    Popup.back();
   },
   'click .js-open-archived-board'() {
     Modal.open('archivedBoards');
@@ -53,7 +53,7 @@ Template.memberMenuPopup.events({
     AccountsTemplates.logout();
   },
   'click .js-go-setting'() {
-    Popup.close();
+    Popup.back();
   },
 });
 
@@ -155,7 +155,7 @@ Template.editProfilePopup.events({
     } else Popup.back();
   },
   'click #deleteButton': Popup.afterConfirm('userDelete', function() {
-    Popup.close();
+    Popup.back();
     Users.remove(Meteor.userId());
     AccountsTemplates.logout();
   }),