RFR: 8310846: Skip failing test InitialWindowSizeTest on Linux

[Kevin Rushforth]

On Sun, 25 Jun 2023 02:10:58 GMT, Michael Strauß <mstrauss at openjdk.org> wrote:

> Skips `InitialWindowSizeTest` on Linux until [JDK-8310845](https://bugs.openjdk.org/browse/JDK-8310845) is fixed.

This looks good, and I verified that the test is now skipped on Linux.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1162#pullrequestreview-1498773655