CSS: m.facebook.com

This script adjusts UI of m.facebook.com to enable text copying on mobile browsers:
- the link, which covers the whole message text, is removed (not relevant under the new UI since the end of June 2023)
- cursor is made normal
- text selection is allowed. In previous version of UI it worked by long tap. After UI update at the end of June 2023 it works by double tap. Now the text selection is impossible for posts with "...see more" link; trying to fix it.