fix: remove all shellcheck directives

ShellCheck directives are of course commented, but OpenSSH¹
has multiple instances where `#` is not followed by a space:
`#shellcheck disable...`² instead of `# shellcheck disable...`.

The upgraded `shellcheck_d` function now removes both types using
vintage POSIX-compliant `sed`.

1. openssh/openssh-portable@108676c3f2
2. https://github.com/openssh/openssh-portable/blob/108676c3f2/contrib/ssh-copy-id#L298

Signed-off-by: Lucas Larson <LucasLarson@riseup.net>

Author: LucasLarson

custom/aliases.sh

@@ -8277,8 +8277,8 @@ shellcheck_d() {
       command -p -- rm -f -- "${TMPDIR:-${TEMP:-${TMP:-/tmp}}}"'/'"${1##*/}" &&
       command -p -- cp -f -p -- "${1-}" "${TMPDIR:-${TEMP:-${TMP:-/tmp}}}"'/'"${1##*/}" &&
       command -p -- sed \
-        -e '/\#[[:blank:]][[:blank:]]*shellcheck[[:blank:]][[:blank:]]*disable/ d' \
-        -e 's/[[:blank:]]*\#[[:blank:]][[:blank:]]*shellcheck[[:blank:]][[:blank:]]*shell=\(.*\)sh/#!\/usr\/bin\/env \1sh/' \
+        -e '/\#[[:blank:]]*shellcheck[[:blank:]][[:blank:]]*disable/ d' \
+        -e 's/[[:blank:]]*\#[[:blank:]]*shellcheck[[:blank:]][[:blank:]]*shell=\(.*\)sh/#!\/usr\/bin\/env \1sh/' \
         "${TMPDIR:-${TEMP:-${TMP:-/tmp}}}"'/'"${1##*/}" \
         >"${1-}"
     shift