Please support all alias for busybox shell equally

[ale5000-git]

For new checks and feature suggestions

• [x] https://www.shellcheck.net/ (i.e. the latest commit) currently gives no useful warnings about this
• [x] I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

#!/bin/busybox bash

#!/bin/busybox ash

#!/bin/busybox sh

Here's what I wanted or expected to see:

sh, ash and bash in busybox are just alias of the same busybox shell, a sort of ash (with some bash extension), even when called as busybox sh. Only busybox hush is a different shell.