bug#57467: 'guix shell' does not honor default behavior when given a specific command to run

[Thompson, David]

Hi again,

I decided to just implement the fix and see what people think of it.  Simply removing a check for non-interactive invocation solves the issue and now 'guix shell' and 'guix shell -- make' act exactly the same except for which command they run.  Patch attached.

- Dave

0001-shell-Look-for-manifest.scm-guix.scm-in-non-interact.patch
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