shell-completion: Add -n option for bootctl

Introduced in f5ffb38606

shell-completion/bash/bootctl

@@ -37,7 +37,7 @@ _bootctl() {
                       --print-stub-path -R --print-root-device -RR
                       --print-efi-architecture
                       --no-pager --graceful -q --quiet --all-architectures
-                      --dry-run'
+                      -n --dry-run'
         [ARG]='--esp-path --boot-path --root --image --image-policy --install-source
                --variables --random-seed --make-entry-directory --entry-token --json
                --efi-boot-option-description --efi-boot-option-description-with-device

shell-completion/zsh/_bootctl

@@ -104,7 +104,7 @@ _arguments \
     '--make-machine-id-directory=[Control creation and deletion of the top-level machine ID directory.]:options:(yes no auto)' \
     '--no-pager[Do not pipe output into a pager]' \
     '--graceful[Do not fail when locating ESP or writing fails]' \
-    '--dry-run[Dry run (unlink and cleanup)]' \
+    '(-n --dry-run)'{-n,--dry-run}'[Dry run (unlink and cleanup)]' \
     '--oldest=[Delete oldest boot menu entry]:options:(yes no)' \
     '--root=[Operate under the specified directory]:PATH' \
     '--image=[Operate on the specified image]:PATH' \