Use also truname of temporary-file-directory in shadowfile-tests.el

* test/lisp/shadowfile-tests.el (top): Use truename of
`temporary-file-directory' and
`shadow-test-remote-temporary-file-directory'.  (Bug#37202)
(shadow-test08-shadow-todo, shadow-test09-shadow-copy-files):
Do not bind `shadow-test-remote-temporary-file-directory'.
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Status Job ID Name Coverage
  Test
passed #3294
test-all

00:55:16