XCF: testcase update for fixed Qt
Updated testcases to work with Qt without alpha [bug](https://bugreports.qt.io/browse/QTBUG-120614.). Needs Qt >= 6.6.2 for tests to pass
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Updated testcases to work with Qt without alpha [bug](https://bugreports.qt.io/browse/QTBUG-120614.). Needs Qt >= 6.6.2 for tests to pass