tests: Use AM_TESTS_ENVIRONMENT rather than TESTS_ENVIRONMENT

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The latter is reserved for the user to set in their environment. The
former is what the makefile is supposed to set.

See
https://www.gnu.org/software/automake/manual/html_node/Scripts_002dbased-Testsuites.html.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

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