kunit: test: fix Makefile CONFIG_ for death test

In c911639be3c420546384b906e8704dfe281c9af3 (kunit: test: move death
test to its own KUnit config), I accidentally included the new death
test into the old CONFIG_TEST_TEST config instead of the new
CONFIG_TEST_DEATH_TEST config created for it; this fixes that.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Google-Bug-Id: 116313114
Squash: c911639be3c420546384b906e8704dfe281c9af3
Change-Id: I1a9354b87eab64dba72385a8b16b560e160d3c2e
1 file changed