implemented editing of list credentials for admin/owner, fixed bug:

if login fails due to wrong auth, it is no longer repeated. instead, the list is disabeld

src/main/java/de/srsoftware/widerhall/data/ListMember.java

@@ -406,6 +406,10 @@ public class ListMember {
         }
     }
 
+    public static void updateListEmail(String oldEmail, String newEmail) throws SQLException {
+        Database.open().update(TABLE_NAME).set(LIST_EMAIL,newEmail).where(LIST_EMAIL,oldEmail).compile().run();
+    }
+
     public User user(){
         return user;
     }