save memo correctly

public/views/modals/tx-details.html

@@ -141,7 +141,6 @@
       <div class="item item-icon-right" ng-click="showCommentPopup()">
         <span class="text-gray" translate ng-show="!btx.note">Add Memo</i></span>
         <span class="text-gray" translate ng-show="btx.note">Memo</span>
-        <i class="icon nav-item-arrow-right"></i>
         <div ng-show="btx.note && btx.note.body">
           <span class="enable_text_select">{{btx.note.body}}</span><br>
           <span class="text-italic item-note size-12">

src/js/controllers/modals/txDetails.js

@@ -81,7 +81,12 @@ angular.module('copayApp.controllers').controller('txDetailsController', functio
   };
 
   $scope.showCommentPopup = function() {
-    popupService.showPrompt(gettextCatalog.getString('Memo'), ' ', {}, function(text) {
+    var opts = {};
+    if ($scope.btx.note && $scope.btx.note.body) opts.defaultText = $scope.btx.note.body;
+
+    popupService.showPrompt(null, gettextCatalog.getString('Memo'), opts, function(text) {
+      if (typeof text == "undefined") return;
+
       $log.debug('Saving memo');
 
       var args = {

src/js/services/popupService.js

@@ -37,7 +37,7 @@ angular.module('copayApp.services').service('popupService', function($log, $ioni
       inputPlaceholder: opts.inputPlaceholder,
       defaultText: opts.defaultText
     }).then(function(res) {
-      return cb(res)
+      return cb(res);
     });
   };