8367017: Remove legacy checks from WrappedToolkitTest and convert from bash

[mrserb]

The Toolkit/Headless/WrappedToolkitTest/WrappedToolkitTest.sh test:

• Checks the "XToolkit" environment property, which was removed a long time ago
• Checks the "awt.toolkit" java property, which was also removed a long time ago
  Since both have been removed, we can simplify the test and additionally drop the use of the bash script.

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• JDK-8367017: Remove legacy checks from WrappedToolkitTest and convert from bash (Bug - P4)

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