sys/posix/sockets: fix code style & set sin6_scope_id in _ep_to_sockaddr()

[maribu]

Contribution description

• Fix double indent of switch cases to single indent, as per coding convention. (Whitespace only change.)
• Set sin6_scope_id to netif in _ep_to_sockaddr()

Testing procedure

• Check the first commit indeed is a whitespace only change
  • except for an assert(0) added to the default: case of a switch replacing an assert((ep->family == AF_INET) || (ep->family == AF_INET6)); before the switch(ep->family). But this does the same, while being more readable.
• Review the second commit (a one-liner)

Issues/PRs references

Fixes #19486

[riot-ci]

Murdock results

✔️ PASSED

77afc5e sys/posix/sockets: set sin6_scope_id in _ep_to_sockaddr()

Success	Failures	Total	Runtime
6933	0	6933	11m:30s

Artifacts

• Documentation preview

[benpicco]

bors merge

[bors]

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• Murdock
• static-tests
• tools-build-success

[maribu]

Thx :)