RFR: 8265786: ProblemList serviceability/sa/sadebugd/DisableRegistryTest.java on ZGC

[Daniel D.Daugherty]

A trivial fix to ProblemList serviceability/sa/sadebugd/DisableRegistryTest.java on ZGC.

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Commit messages:
 - 8265786: ProblemList serviceability/sa/sadebugd/DisableRegistryTest.java on ZGC

Changes: https://git.openjdk.java.net/jdk/pull/3641/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3641&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265786
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3641.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3641/head:pull/3641

PR: https://git.openjdk.java.net/jdk/pull/3641