Update assertion in testUserspaceRebootWatchdogTriggers

Bug: 152803929
Test: atest CtsUserspaceRebootHostSideTestCases
Change-Id: If5142cbdb5aabccddd72c7c6a29a97a8cc8ab446
Merged-In: If5142cbdb5aabccddd72c7c6a29a97a8cc8ab446
(cherry picked from commit 7d0d8e84868466c95cc271d361335e846b4a0d81)
1 file changed