Remove TODO for supporting streams in Java FLAC extractor

Flac streams exist but are not commonly used. Also, they are not
supported by the FLAC extension extractor.

PiperOrigin-RevId: 284514327

library/core/src/main/java/com/google/android/exoplayer2/extractor/flac/FlacExtractor.java

@@ -43,7 +43,6 @@ import java.lang.annotation.RetentionPolicy;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 
 // TODO: implement seeking.
 // TODO: implement seeking.
-// TODO: support live streams.
 /**
 /**
  * Extracts data from FLAC container format.
  * Extracts data from FLAC container format.
  *
  *