d/copyright: put more general statement first

This solves lintian warnings:

I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 10
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 15
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 19
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 23
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 28
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 33
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 37
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 42
I: nftables source: unused-file-paragraph-in-dep5-copyright paragraph at line 5

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>