Remove unused UserListItem.getAccount() method

Signed-off-by: Chris Narkiewicz <hello@ezaquarii.com>

src/main/java/com/owncloud/android/ui/adapter/UserListItem.java

@@ -63,10 +63,6 @@ public class UserListItem {
         type = TYPE_ACTION_ADD;
     }
 
-    public Account getAccount() {
-        return user.toPlatformAccount();
-    }
-
     public User getUser() {
         return user;
     }