We no longer have to cleanup the temp dir as it's cleaned up in the body, fixes #1457

[rfay]

The Problem/Issue/Bug:

OP #1457 reported a warning (it turned out to be only a warning) that the temp directory on ddev composer create was not being deleted. It turns out that we had actually improved the code that moves everything, so it was no longer necessary to do the cleanup at all.

How this PR Solves The Problem:

Remove the obsolete code, and the defer that called it.

Manual Testing Instructions:

mkdir junk && cd junk
ddev composer create --prefer-dist --no-interaction --no-dev psr/log 1.1.0

• You should not see a warning about failing to remove
• ls -a should show no leftover .tmp directory

Automated Testing Overview:

Related Issue Link(s):

OP #1457

[andrewfrench]

I can confirm the original issue (the erroneous warning), that this change prevents it, and that the temp directory is cleaned up by the existing process. Good catch, sorry for not noticing this!