Added back button to cloud password step in intro.

Telegram/SourceFiles/intro/intro_password_check.h

@@ -35,6 +35,10 @@ public:
 	void submit() override;
 	rpl::producer<QString> nextButtonText() const override;
 
+	bool hasBack() const override {
+		return true;
+	}
+
 protected:
 	void resizeEvent(QResizeEvent *e) override;
 

Telegram/SourceFiles/intro/intro_widget.cpp

@@ -849,7 +849,7 @@ void Widget::backRequested() {
 		Core::App().domain().activate(parent);
 	} else {
 		moveToStep(
-			new StartWidget(this, _account, getData()),
+			Ui::CreateChild<StartWidget>(this, _account, getData()),
 			StackAction::Replace,
 			Animate::Back);
 	}