[Toybox] [PATCH] touch.test: add missing `TZ=utc`s.

[enh]

I don't know why we fixed the other tests but not this one. Before this
patch it's failing with/without TEST_HOST. After this patch, it passes
both.
---
 tests/touch.test | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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