welcome view: display username if available

Instead of displaying the ringID we display the registered name if
available

Change-Id: I070c9edd6bdf2f7aa97d6c7ad1042a9c962db711
Tuleap: #1342
diff --git a/src/RegisterNameWC.mm b/src/RegisterNameWC.mm
index 87b98d9..d1ea565 100644
--- a/src/RegisterNameWC.mm
+++ b/src/RegisterNameWC.mm
@@ -229,6 +229,8 @@
                                                      break;
                                                  case NameDirectory::RegisterNameStatus::SUCCESS:
                                                      [self.delegate didRegisterNameWithSuccess];
+                                                     // Artificial refresh of the model to update the welcome view
+                                                     Q_EMIT AccountModel::instance().dataChanged(QModelIndex(), QModelIndex());
                                                      break;
                                              }
                                          });