wizardview: fix username registration when creating account

Change-Id: I4ee435166e5866c3a0323b1783f591964c8c93f2

src/wizardview/WizardView.qml

@@ -244,7 +244,7 @@ Rectangle {
                     inputParaObject = {}
                     inputParaObject["password"] = text_passwordEditAlias
                     ClientWrapper.accountAdaptor.createJamiAccount(
-                        text_usernameEditAlias.text,
+                        createAccountPage.text_usernameEditAlias,
                         inputParaObject,
                         createAccountPage.boothImgBase64,
                         true)