RFR: 8064: Typo in agent wizard

[Marius Volkhart]

prset -> preset

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Commit messages:
 - Fix typo in editor message

Changes: https://git.openjdk.org/jmc/pull/474/files
 Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=474&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8064
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmc/pull/474.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/474/head:pull/474

PR: https://git.openjdk.org/jmc/pull/474