CertificateTest: fix error-prone code in test

There was a comparison of a byte against the value 200, which would
always fail. From the code below it's evident that the comparison should
be against the value 200 casted as a byte.

Test: vogar CertificateTest

(cherry picked from commit 2cdb68f718098570bf466661d5aba3f1ceba566a)

Change-Id: I86f9ff925a81dc6d0f174063992745db558ca73c
2 files changed