Codechange: use std::string_view for ini_key

src/highscore_gui.cpp

@@ -214,14 +214,14 @@ static constexpr NWidgetPart _nested_highscore_widgets[] = {
 };
 
 static WindowDesc _highscore_desc(
-	WDP_MANUAL, nullptr, 0, 0,
+	WDP_MANUAL, {}, 0, 0,
 	WC_HIGHSCORE, WC_NONE,
 	{},
 	_nested_highscore_widgets
 );
 
 static WindowDesc _endgame_desc(
-	WDP_MANUAL, nullptr, 0, 0,
+	WDP_MANUAL, {}, 0, 0,
 	WC_ENDSCREEN, WC_NONE,
 	{},
 	_nested_highscore_widgets