extrahd.cgi: Drop select for FS selection.

extrahd.cgi: Drop select for FS selection.

This feature does not have any benefit because the linux kernel
knows best which filesystem a device/partition has.

So there is no need for a user to specify this by-hand. This also
prevents from choosing a wrong fs type and as a direct result in a
not mountable device.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>