RFR: JDK-8319318: bufferedStream fixed case can be removed

[Thomas Stuefe]

Trivial change to remove an unused constructor / use case for bufferedStream

Tests: GHAs (Windows error unrelated)

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Commit messages:
 - JDK-8319318-bufferedStream-fixed-case-can-be-removed

Changes: https://git.openjdk.org/jdk/pull/16475/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16475&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319318
  Stats: 68 lines in 3 files changed: 4 ins; 42 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/16475.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16475/head:pull/16475

PR: https://git.openjdk.org/jdk/pull/16475