initialize screens only if necessary

src/search_engine.h

@@ -40,7 +40,6 @@ class SearchEngine : public Screen< Menu< std::pair<Buffer *, MPD::Song *> > >
 	};
 	
 	public:
-		virtual void Init();
 		virtual void Resize();
 		virtual void SwitchTo();
 		
@@ -69,6 +68,9 @@ class SearchEngine : public Screen< Menu< std::pair<Buffer *, MPD::Song *> > >
 		static const char *NormalMode;
 		static const char *StrictMode;
 		
+	protected:
+		virtual void Init();
+		
 	private:
 		void Prepare();
 		void Search();