Hey guys. The thing is after next update the whole file structure will be updated and the files you have deleted will be there again. I’ve found easier way to fix it.
First of all, insted of changing a style.css, you can put some styles in the Custom Css section within the plugin admin menu. But you need to get rid of the link not just an image of button!!! So, take a look at the source code of the page and find out under what class or section it’s located and what styles you have to apply. Notice, depending on your settings of the plugin my solution may not be the best for your site, as it can make other buttons desapear too (I supose:), but you as ease can delete this style and make everything look as before. Ok, this is what I used:
span.mr_social_sharing a {
display: none !important;
}