Removed event context from storyscreen controller

This fixes an issue where no click would register if using the GUI2 storyscreen dialog. Its removal doesn't seem
to have any effect on the GUI1 one either.

src/storyscreen/controller.cpp

@@ -44,7 +44,6 @@ namespace storyscreen {
 controller::controller(CVideo& video, const vconfig& data, const std::string& scenario_name,
 		       int segment_index)
 	: video_(video)
-	, evt_context_()
 	, scenario_name_(scenario_name)
 	, segment_index_(segment_index)
 	, parts_()

src/storyscreen/controller.hpp

@@ -67,7 +67,6 @@ private:
 	void resolve_wml(const vconfig& cfg);
 
 	CVideo& video_;
-	const events::event_context evt_context_;
 
 	std::string scenario_name_;
 	int segment_index_;