tests: correct application of ! / not

A single test started failing after introduction of the "not" program. The specific code was (broken down for readability): su -l -c 'test-snapd-sh.with-home-plug -c \	"ln /home/test/snap/test-snapd-sh/common/evil-2 /home/test/bin/evil-2"' test \	2>&1 | not MATCH '.* Permission denied' Originally there was a `!` in front of the entire expression. At runtime we observe the actual denial, that is symlinking from `$SNAP_USER_COMMON` to `$HOME/bin` is correctly denied, but with, now correctly working negation, it started to fail the test. I'm unsure as to why this happened but a working theory is that the prior approach was designed for `set -o pipefail`, where the `su` command would return the result of failing `ln` command which would cause the whole pipe expression to fail. The fix is to simply remove the negation, since the test works as expected exactly as-is. Signed-off-by: Zygmunt Krynicki <me@zygoon.pl> 

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