files: Drop shebangs from config files

files: Drop shebangs from config files

These are not meant to be executed as is but instead loaded via
'nft -f' - all-in-one.nft even points this out in header comment.
While being at it, drop two spelling mistakes found along the way.

Consequently remove executable bits - being registered in automake as
dist_pkgsysconf_DATA, they're changed to 644 upon installation anyway.

Also there is obviously no need for replacement of nft binary path
anymore, drop that bit from Makefile.am.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>