RFR: 8310075: Revert accidental change to jcheck configuration for shenandoah project

[Aleksey Shipilev]

On Wed, 14 Jun 2023 23:32:42 GMT, William Kemper <wkemper at openjdk.org> wrote:

> This bit of the configuration was clobbered with https://github.com/openjdk/shenandoah/pull/285.

Oh, you might need a _JDK_ project Reviewer to change that thing :)

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Marked as reviewed by shade (Reviewer).

PR Review: https://git.openjdk.org/shenandoah/pull/288#pullrequestreview-1481902521