Refresh lintian-overrides to fix SalsaCI pipeline

This MR fixes two lintian issues, as reported by the SalsaCI pipeline in !12 (merged)

• Drop obsolete package-supports-alternative-init-but-no-init.d-script tag, see: lintian/lintian!473 (merged)
• Fix non-standard-dir-perm tag

Please note that besides SalsaCI, https://udd.debian.org/lintian/?packages=wireguard is also reporting issues about:

wireguard-tools/1.0.20210914-1.1 | error | alien-tag | package-supports-alternative-init-but-no-init.d-script [usr/share/lintian/overrides/wireguard-tools:8]

wireguard-tools/1.0.20210914-1.1 | warning | mismatched-override | non-standard-dir-perm etc/wireguard/ 0700 != 0755 [usr/share/lintian/overrides/wireguard-tools:4]

Cherry-picked from !8 (closed) (to present the big MR!8 in smaller pieces)