test: fix labels for set_check bt-daemon test
test: fix labels for set_check bt-daemon test

The set_check test will break if Smack checks are enabled, so make sure
this test sets a key with a label for which the client has RW access.

In the following commit, Smack checks will be enforced for all tests
when the host OS is Smack-enabled.

sofar/buxton,sofar/buxton