ash: fix regression with 'exec sh -s'

It was noted this command didn't work properly:

   su -t -c 'exec sh -s -c "echo 123"'

The child shell performed the 'echo' but then exited, despite the
'-s' flag.  This is a regression introduced by commit 074ebfca21
(ash: code shrink).

This simpler command also failed the same way:

   sh -c "exec sh -s"

This regression dates back even further, to commit da7c8cdf63
(ash: run ash_main() directly from a FS_SHELLEXEC shell).

The issue can be avoided if shells invoked by the 'exec' builtin
aren't run by calling ash_main() directly.

Adds 80-96 bytes.

GitHub issue #461.

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