RFR: 8346576: Remove vmTestbase/gc/memory/Nio/Nio.java from test/hotspot/jtreg/ProblemList.txt

[Brian Burkhalter]

Remove from problem list test which should have been removed in #22339.

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Commit messages:
 - 8346576: Remove vmTestbase/gc/memory/Nio/Nio.java from test/hotspot/jtreg/ProblemList.txt

Changes: https://git.openjdk.org/jdk/pull/22819/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22819&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346576
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22819.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22819/head:pull/22819

PR: https://git.openjdk.org/jdk/pull/22819