Use requested_security_level_ in SupportsUsageTable

Also fix a build warning from an earlier CL.

Merged from Widevine CDM repo:
https://widevine-internal-review.googlesource.com/#/c/13669/

Change-Id: I87f161afac76e622869e5370e4f63476cb3ea97f

libwvdrmengine/cdm/core/src/crypto_session.cpp

@@ -693,8 +693,7 @@ bool CryptoSession::UsageInformationSupport(bool* has_support) {
   LOGV("UsageInformationSupport: id=%ld", (uint32_t)oec_session_id_);
   if (!initialized_) return false;
 
-  *has_support = OEMCrypto_SupportsUsageTable(
-      kSecurityLevelL3 == GetSecurityLevel() ? kLevel3 : kLevelDefault);
+  *has_support = OEMCrypto_SupportsUsageTable(requested_security_level_);
   return true;
 }