Fixed minor issue in CompressionTypeSupported()

Summary:
CompressionTypeSupported was returning LZ4_Supported() for
kZSTDNotFinalCompression. This patch changes it to ZSTD_Supported().

Test Plan: make clean all check

Reviewers: rven, anthony, yhchiang, sdong, igor

Reviewed By: igor

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D46521

util/compression.h

@@ -89,7 +89,7 @@ inline bool CompressionTypeSupported(CompressionType compression_type) {
     case kLZ4HCCompression:
       return LZ4_Supported();
     case kZSTDNotFinalCompression:
-      return LZ4_Supported();
+      return ZSTD_Supported();
     default:
       assert(false);
       return false;