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

[Y. Srinivas Ramakrishna]

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.

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/shenandoah/pull/288#pullrequestreview-1480453248