Display back button in login with 'assistant_go_directly_to_third_party_sip_account_login' option.

Linphone/view/Page/Form/Login/SIPLoginPage.qml

@@ -31,7 +31,6 @@ LoginLayout {
 					console.debug("[SIPLoginPage] User: return")
 					mainItem.goBack()
 				}
-				visible: !SettingsCpp.assistantGoDirectlyToThirdPartySipAccountLogin
 			}
 			Image {
 				fillMode: Image.PreserveAspectFit

Linphone/view/Page/Window/Main/MainWindow.qml

@@ -134,7 +134,12 @@ AbstractWindow {
 	Component {
 		id: sipLoginPage
 		SIPLoginPage {
-			onGoBack: mainWindowStackView.pop()
+			onGoBack: {
+				if(SettingsCpp.assistantGoDirectlyToThirdPartySipAccountLogin)
+					mainWindowStackView.replace(mainPage)
+				else
+					mainWindowStackView.pop()
+			}
 			onGoToRegister: mainWindowStackView.replace(registerPage)
 			
 			onConnectionSucceed: {