intrapred_test: remove a stale comment

Change-Id: I87fac64fb6b44f5f2c4a935fa97fbddaa31ca107
diff --git a/test/intrapred_test.cc b/test/intrapred_test.cc
index bfe9c8f..4d40d29 100644
--- a/test/intrapred_test.cc
+++ b/test/intrapred_test.cc
@@ -239,8 +239,6 @@
 GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(LowbdIntraPredTest);
 
 #if CONFIG_AV1_HIGHBITDEPTH
-// Suppress an unitialized warning. Once there are implementations to test then
-// this can be restored.
 TEST_P(HighbdIntraPredTest, Bitexact) {
   // max block size is 64
   DECLARE_ALIGNED(16, uint16_t, left_col[2 * 64]);