RFR: 8320386: Remove java/nio/channels/vthread/BlockingChannelOps.java#direct-register from ProblemList

[Daniel Jeliński]

The direct-register test variant was removed in c099cf53f25496c99629dc578045aa5186e1109d. The failing test case was also modified - the socket timeout is much shorter now, so even if the receive operation gets stuck for the full duration, the test will still pass.

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Commit messages:
 - Problemlist cleanup

Changes: https://git.openjdk.org/jdk/pull/16732/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16732&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320386
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/16732.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16732/head:pull/16732

PR: https://git.openjdk.org/jdk/pull/16732