Refactor register and verify

src/main/java/org/asamk/signal/commands/UpdateAccountCommand.java

@@ -16,10 +16,6 @@ public class UpdateAccountCommand implements LocalCommand {
 
     @Override
     public int handleCommand(final Namespace ns, final Manager m) {
-        if (!m.isRegistered()) {
-            System.err.println("User is not registered.");
-            return 1;
-        }
         try {
             m.updateAccountAttributes();
             return 0;