Disable default image source tabs

[dishly]

Hello Iliya,

First of all, I'd like to thank you for the great job you've done with this component.

I've implemented the image extension and everything works fine except one thing. Following your documentation, when I add imageSourcesOverride: true in the extension's options, default tabs are hidden in the modal window, but there's one empty tab that appears next to my custom "File Selector" component tab.

Do you know how can I get rid of that empty tab? Thanks for your help