RFR: 8451: Should make the Event Type the first column of event types tree table

[Aymane Harmaz]

This PR made sure to display the event type column as the first column in the table related to event types tree view to make it easier for the user to identify the event type of the rows he will be looking at when multiple event types are selected.

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Commit messages:
 - 8451: Should make the Event Type the first column of event types tree table

Changes: https://git.openjdk.org/jmc/pull/681/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=681&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8451
  Stats: 6 lines in 2 files changed: 1 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jmc/pull/681.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/681/head:pull/681

PR: https://git.openjdk.org/jmc/pull/681