Lv2ControlBase: Remove unused virtuals

They were never used. Possibly they were just in the code because the
code originated from #4662 (where the virtuals would also be
omittable...).

include/Lv2ControlBase.h

@@ -142,11 +142,6 @@ protected:
 		const class TimePos &time, f_cnt_t offset);
 
 private:
-	//! Return the DataFile settings type
-	virtual DataFile::Types settingsType() = 0;
-	//! Inform the plugin about a file name change
-	virtual void setNameFromFile(const QString &fname) = 0;
-
 	//! Independent processors
 	//! If this is a mono effect, the vector will have size 2 in order to
 	//! fulfill LMMS' requirement of having stereo input and output