Stabilize tst_QComboBox::setPalette() with simple palettes

The test function tst_QComboBox::setPalette() tests if the QComboBox
correctly inherits its palette to its QLineEdit child, by directly
comparing both palettes after a palette change on the QComboBox.

If the application palette for both widget types contains brushes which
are either pixmap based or the resolve mask prevents them from being
copied, the direct palette comparison between parent and child fails,
despite of a correct propagation.

This patch sets a simple gray application palette for QComboBox and
QLineEdit at the beginning of the test. The QSKIP for macOS is
removed, because using simple palettes solves both issues.


Change-Id: I61d509745377306d6f8331dfc1ac189fc58cdedb
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

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