mediapc: Remove redundant secureWithUnsecure check MultiDecoderPairPerfTest was trying to invoke more than the supported number of instances in some cases because secureWithUnsecure combination ignored the number of instances supported. Test: atest android.mediapc.cts.MultiDecoderPairPerfTest Bug: 322899169 Change-Id: I85b7f9a413f02fa2ecb70a96c33de4bd937d58ca