Remove hack introduced in http4s#1202, fixed upstream

core/src/main/scala/org/http4s/StaticFile.scala

@@ -8,13 +8,11 @@ import java.time.Instant
 import cats.effect.Sync
 import fs2.Stream._
 import fs2._
-import fs2.interop.scodec.ByteVectorChunk
 import fs2.io._
 import fs2.io.file.{FileHandle, pulls}
 import org.http4s.Status.NotModified
 import org.http4s.headers._
 import org.log4s.getLogger
-import scodec.bits.ByteVector
 
 // TODO: consider using the new scalaz.stream.nio.file operations
 object StaticFile {
@@ -44,10 +42,6 @@ object StaticFile {
       Some(Response(
         headers = headers,
         body    = readInputStream[F](F.delay(url.openStream), DefaultBufferSize)
-          // These chunks wrap a mutable array, and we might be buffering
-          // or processing them concurrently later.  Convert to something
-          // immutable here for safety.
-          .mapChunks(c => ByteVectorChunk(ByteVector(c.toArray)))
       ))
     } else Some(Response(NotModified))
   }