RFR: 8372120: Add missing sound keyword to MIDI tests

[David Holmes]

On Tue, 18 Nov 2025 22:22:36 GMT, Alexander Zuev <kizune at openjdk.org> wrote:

> Add missing keyword to the tests where it is required but missing.

Seems fine to me. Just to be clear these "key" values simply allow you to tell jtreg to include/exclude a test based on the key value, so it just gives finer-grained control.

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28382#pullrequestreview-3480099319