RFR: 8371573: Shenandoah: Fix style of include directive

[William Kemper]

On Mon, 10 Nov 2025 15:32:03 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

> Fix style of include directive for improved consistency and compatibility with GraalVM conventions.

This include looks vestigial. Can we just delete it?

-------------

Changes requested by wkemper (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28219#pullrequestreview-3443924743