Wallet Settings button in Wallet Details

www/views/preferences.html

@@ -3,7 +3,7 @@
     <ion-nav-title>
       {{'Wallet Settings'|translate}}
     </ion-nav-title>
-    <ion-nav-back-button>
+    <ion-nav-back-button ng-click="goBack()">
     </ion-nav-back-button>
   </ion-nav-bar>
   <ion-content>

www/views/walletDetails.html

@@ -8,6 +8,9 @@
       <button class="button back-button" ng-click="startSearch(); openSearchModal()" ng-if="txHistory.length > 4">
         <i class="icon ion-ios-search-strong tx-search"></i>
       </button>
+      <button class="button" ng-click="openSettings();">
+        <i class="icon ion-android-settings"></i>
+      </button>
     </ion-nav-buttons>
   </ion-nav-bar>
   <style type="text/css">