refactor: change netinit/in.h #include order

[aloisklink]

On FreeBSD, #include <netinit/in.h> should come before #include <netinit/if_ether.h>, as otherwise struct in_addr won't be defined.

I've modified the .clang-format rules so that after #116 gets merged, this shouldn't cause any issues.

[codecov]

Codecov Report

Merging #253 (4763da4) into main (1c9a82a) will decrease coverage by 0.69%.
The diff coverage is n/a.

❗ Current head 4763da4 differs from pull request most recent head 97d25d6. Consider uploading reports for the commit 97d25d6 to get more accurate results

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   48.51%   47.82%   -0.70%     
==========================================
  Files         113      113              
  Lines       17887    19361    +1474     
==========================================
+ Hits         8678     9259     +581     
- Misses       9209    10102     +893     

Impacted Files	Coverage Δ
src/utils/nl.c	8.98% <0.00%> (-1.74%)	⬇️
src/utils/os.c	44.37% <0.00%> (-0.92%)	⬇️
src/utils/iface.c	20.00% <0.00%> (-0.54%)	⬇️
src/config.c	0.00% <0.00%> (ø)
src/edgesec.c	0.00% <0.00%> (ø)
src/utils/ifaceu.c	100.00% <0.00%> (ø)
tests/dns/test_mdns_list.c	100.00% <0.00%> (ø)
tests/dns/test_mdns_mapper.c	100.00% <0.00%> (ø)
tests/dhcp/test_dhcp_service.c	100.00% <0.00%> (ø)
tests/dns/test_command_mapper.c	100.00% <0.00%> (ø)
... and 17 more

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