[mirrorlist] Remove ftp mirrors from the default list

[Abdul Halim Mat Ali <sagikliwon@xxxxxxxxx>]

I don't find download small files is slow especially when the mirror is at
your country.
Furthermore, my country namely Singapore only have one mirror and that one
mirror using FTP.

Arch-devs. Kindly do not delete FTP from the list.
The mirrors list are user config and not everybody use the same mirror and
it is up to us
to use which mirror. So, I don't see a point on remove the ftp mirrors.