Remove registrationLockV1 code

The corresponding endpoint has been removed on the Signal server

lib/src/main/java/org/asamk/signal/manager/Manager.java

@@ -472,9 +472,6 @@ public class Manager implements Closeable {
 
             account.setRegistrationLockPin(pin.get(), masterKey);
         } else {
-            // Remove legacy registration lock
-            dependencies.getAccountManager().removeRegistrationLockV1();
-
             // Remove KBS Pin
             pinHelper.removeRegistrationLockPin();