Transformer: Always initialize presentationTime in VTSP.

This shouldn't really have anything to do with HDR.

PiperOrigin-RevId: 493357915

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/VideoTranscodingSamplePipeline.java

@@ -110,10 +110,10 @@ import org.checkerframework.dataflow.qual.Pure;
             /* mediaCodecName= */ null,
             /* mediaCodecName= */ null,
             TransformationException.ERROR_CODE_HDR_ENCODING_UNSUPPORTED);
             TransformationException.ERROR_CODE_HDR_ENCODING_UNSUPPORTED);
       }
       }
-
-      finalFramePresentationTimeUs = C.TIME_UNSET;
     }
     }
 
 
+    finalFramePresentationTimeUs = C.TIME_UNSET;
+
     decoderInputBuffer =
     decoderInputBuffer =
         new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DISABLED);
         new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DISABLED);
     encoderOutputBuffer =
     encoderOutputBuffer =