Add smaller icons for playlists and directory files

lua/images.lua

@@ -29,6 +29,8 @@ local img = {
   unlistened = lvgl.ImgData("//lua/img/unlistened.png"),
   info = lvgl.ImgData("//lua/img/info.png"),
   menu = lvgl.ImgData("//lua/img/menu.png"),
+  file_directory = lvgl.ImgData("//lua/img/file_icons/directory.png"),
+  file_playlist = lvgl.ImgData("//lua/img/file_icons/playlist.png"),
 }
 
 return img

lua/playlist_browser.lua

@@ -62,9 +62,9 @@ return screen:new {
 
     local get_icon_func = function(item)
       if item:is_directory() then
-        return img.files
+        return img.file_directory
       else
-        return img.enqueue
+        return img.file_playlist
       end
     end