Update padding scheme in mock

Merge from widevine repo of http://go/wvgerrit/14370

In order to run on android, we need the mock to compile with
BoringSSL, which uses a different function call for
RSA_padding_add_PKCS1_PSS.

Change-Id: I9cad4e7d5c1d4a3117fe7c0fc1e27590809a7ac3

libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.h

@@ -265,9 +265,9 @@ class CryptoEngine {
   ActiveSessions sessions_;
   WvKeybox keybox_;
   WvTestKeybox test_keybox_;
+  bool use_test_keybox_;
   wvcdm::Lock session_table_lock_;
   UsageTable* usage_table_;
-  bool use_test_keybox_;
   RSA* rsa_key_;  // If no keybox, this is baked in certificate.
 
   CORE_DISALLOW_COPY_AND_ASSIGN(CryptoEngine);