Fix e1f5be62: Clear font cache when toggling sprite font.

This is necessary for the sprite font height and ascender to be updated correctly.

src/settings_gui.cpp

@@ -573,6 +573,7 @@ struct GameOptionsWindow : Window {
 
 				InitFontCache(false);
 				InitFontCache(true);
+				ClearFontCache();
 				SetupWidgetDimensions();
 				ReInitAllWindows(true);
 				break;