Make shellcheck happy

It is intentional that the outer shell do not expand "$0".

qubes-rpc/qvm-open-in-vm

@@ -48,6 +48,7 @@ fi
 
 case "$filename" in
 	*://*)
+        # shellcheck disable=SC2016
         exec /usr/lib/qubes/qrexec-client-vm "$target" qubes.OpenURL /bin/sh -c 'printf "%s\n" "$0"; cat >/dev/null' "$filename"
         ;;
     *)