Detach ComposeControls from SessionController.

Telegram/SourceFiles/intro/intro_phone.cpp

@@ -23,6 +23,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/boxes/confirm_box.h"
 #include "boxes/phone_banned_box.h"
 #include "core/application.h"
+#include "window/window_controller.h"
 #include "window/window_session_controller.h"
 #include "countries/countries_instance.h" // Countries::Groups
 
@@ -46,7 +47,7 @@ PhoneWidget::PhoneWidget(
 : Step(parent, account, data)
 , _country(
 	this,
-	std::make_shared<Window::Show>(getData()->controller),
+	getData()->controller->uiShow(),
 	st::introCountry)
 , _code(this, st::introCountryCode)
 , _phone(