lxc-debian: don't write C.* locales to /etc/locale.gen
lxc-debian: don't write C.* locales to /etc/locale.gen

Doing that confuses locale generation. lxc-ubuntu does the same check

Signed-off-by: Antonio Terceiro <9e4dabace4bf3e60d3d713b56a1c8e7e285b5f80@debian.org>

ss1h2a3tw/lxc,thmo/lxc,thmo/lxc,caglar10ur/lxc,terceiro/lxc,hallyn/lxc,thmo/lxc,hallyn/lxc,terceiro/lxc,caglar10ur/lxc,ss1h2a3tw/lxc,ss1h2a3tw/lxc,hallyn/lxc,caglar10ur/lxc,terceiro/lxc