Update internal opus build

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=184274139

extensions/opus/src/main/java/com/google/android/exoplayer2/ext/opus/OpusLibrary.java

@@ -27,7 +27,7 @@ public final class OpusLibrary {
     ExoPlayerLibraryInfo.registerModule("goog.exo.opus");
   }
 
-  private static final LibraryLoader LOADER = new LibraryLoader("opus", "opusJNI");
+  private static final LibraryLoader LOADER = new LibraryLoader("opusJNI");
 
   private OpusLibrary() {}