cli: Fix usage of httpserver module

Commit f079923 (loader: always run httpserver) made httpserver load regardless
of being included in the cmdline, thus removing the default/full attributes
from module.py.

This patch removes the reference to default and just requires httpserver. For
now, I think httpserver should be included by default when building the CLI.

Signed-off-by: Or Cohen <orc@fewbytes.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>