Fixing generated .htaccess 

`/$1` got deleted from the `RewriteRule`...so I put it back.

Deets:
I got a 404 at http://example.com/admin/login/. When I added `index.php` to the url, http://example.com/index.php/admin/login/, it worked perfectly. Went through and compared the `master` branch's `htaccess.distro.php` with the one in the `dev` branch and found the problem. 

Not sure why it was deleted in the first place?