fixed path for weather images

[nagyrobi]

L:/ is also correct for image path since v0.6.2.

[fvanroie]

Actually for images L:/ is preferred over /littlefs/ because it also works on other platforms (PC/Mac/Linux).

• L:/ uses the LVGL filesystem api, which is platform independent
• /littlefs/ uses the ESP filesystem api, which only works on ESP

For image.src attributes /littlefs/ is automatically converted to L:/ for backwards compatibility, but new attributes will only support the drive-letter.

Sorry for the confusion. Ideally everything would use L:/...

[fbonomini]

Thanks!