shiboken6: Make multiple inheritance cast check less restrictive

The old code would not allow to downcast if a special cast function
exists somewhere in the class hierarchy (as is the case for example
for QWidget inheriting QObject and QPaintDevice).

Make the check more fine-grained by actually checking whether the base
class is a direct, single line inheritance base class of the type
passed in. This makes the mechanism work for widgets.

The corresponding test can then be relaxed.

Task-number: PYSIDE-868
Change-Id: Id81fd9c3080e42009fc84e06a9bab1c8856f2c0c
Reviewed-by: Cristian Maureira-Fredes <[email protected]>

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