8367784: java/awt/Focus/InitialFocusTest/InitialFocusTest1.java failed with Wrong focus owner

[prsadhuk]

Test was deproblemlisted in #27136 without any modifications as it was passing in testing.
Since it again failed, added the execution in EDT to be more thread-safe.

Fix is tested against several CI jobs each with several iterations link of which is in JBS

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Issue

• JDK-8367784: java/awt/Focus/InitialFocusTest/InitialFocusTest1.java failed with Wrong focus owner (Bug - P4)

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