RFR: 8271726: JFR: should use equal() to check event fields in tests

[Denghui Dong]

Hi,

Please help review this trivial test fix.

In TestHeapDump.java, we should use EventField.equal() to check fields, but there are two lines that didn't abide by this rule(I think it's a typo).

No other similar mistake was found in other jfr tests.

Thanks,
Denghui

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Commit messages:
 - 8271726: JFR: should use equal() to check event fields in tests

Changes: https://git.openjdk.java.net/jdk/pull/4970/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4970&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8271726
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4970.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4970/head:pull/4970

PR: https://git.openjdk.java.net/jdk/pull/4970