Change identity password on changing account password for same tld

app/src/main/java/eu/faircode/email/Helper.java

@@ -871,6 +871,14 @@ public class Helper {
         return true;
     }
 
+    static String getTld(String host) {
+        String[] h = host.split("\\.");
+        if (h.length >= 2)
+            return h[h.length - 2] + "." + h[h.length - 1];
+        else
+            return host;
+    }
+
     static int getSize(Bundle bundle) {
         Parcel p = Parcel.obtain();
         bundle.writeToParcel(p, 0);