Revert "If modelRegistrationID is default it will be kept the same than ownerRegistrationID"

This reverts commit b1ea16c3

radio/src/opentx.cpp

@@ -461,6 +461,8 @@ void modelDefault(uint8_t id)
 
   applyDefaultTemplate();
 
+  memcpy(g_model.modelRegistrationID, g_eeGeneral.ownerRegistrationID, PXX2_LEN_REGISTRATION_ID);
+
 #if defined(LUA) && defined(PCBTARANIS) //Horus uses menuModelWizard() for wizard
   if (isFileAvailable(WIZARD_PATH "/" WIZARD_NAME)) {
     f_chdir(WIZARD_PATH);