[suggestion] Make the plugin work without needing transparent background

[OsrsMerchant]

First of, I love this plugin. It's amazing. The only issue for me is that due to eyesight, I struggle a bit to properly read the chat when it's not a static background.

I would love it it could work without needing it as well if possible :)

Thanks for your time!

[Thource]

Will be implemented with runelite/plugin-hub#6248