Move stickers state variables to AuthSessionData.

Also allow to click on the selected set when choosing megagroup
sticker set and allow to paste a t.me link to the set there.

Telegram/SourceFiles/chat_helpers/tabbed_selector.cpp

@@ -698,7 +698,10 @@ void TabbedSelector::scrollToY(int y) {
 	_topShadow->update();
 }
 
-TabbedSelector::Inner::Inner(QWidget *parent, not_null<Window::Controller*> controller) : TWidget(parent)
+TabbedSelector::Inner::Inner(
+	QWidget *parent,
+	not_null<Window::Controller*> controller)
+: RpWidget(parent)
 , _controller(controller) {
 }