Don't call Movie::SetTitleId from ES

Movie basically just wants to get the title ID of
the initally booted game, so let's set the title ID in
ConfigManager at boot like we do with the regular game ID.

Aside from being cleaner, this should make the approach to
title IDs compatible with booting non-disc software (WADs).

Source/Core/Core/Movie.h

@@ -132,7 +132,6 @@ u64 GetTotalLagCount();
 void SetClearSave(bool enabled);
 void SignalDiscChange(const std::string& new_path);
 void SetReset(bool reset);
-void SetTitleId(u64 title_id);
 
 bool IsConfigSaved();
 bool IsDualCore();