make NCurses::Menu::Clear() clear used filter

src/menu.h

@@ -571,6 +571,7 @@ template <typename T> void NCurses::Menu<T>::Clear(bool clrscr)
 		delete *it;
 	itsOptions.clear();
 	itsFound.clear();
+	itsFilter.clear();
 	ClearFiltered();
 	itsOptionsPtr = &itsOptions;
 	if (clrscr)

src/status.cpp

@@ -70,10 +70,7 @@ void StatusbarApplyFilterImmediately(const std::wstring &ws)
 {
 	static std::wstring cmp;
 	if (cmp != ws)
-	{
+		myScreen->ApplyFilter(ToString((cmp = ws)));
-		myScreen->ApplyFilter(ToString(ws));
-		cmp = ws;
-	}
 	myScreen->RefreshWindow();
 	TraceMpdStatus();
 }