Revert "Disable autocomplete": this breaks access to post text after an error, at least in Firefox

This reverts commit 90b82b1a0635d78d536bc92decbdc273d8f7e323.
style-select.js: fix on firefox
style-select.js: add id for a styling ability
These files are no longer used
Merge branch 'master' of https://github.com/savetheinternet/Tinyboard