For members of nested classes inside expect class
`classWrapper.hasExpect()` would be false, because it only reflects
modifiers of nested class itself and not aware of "expect" modifier
inherited from the parent class.
Fix is done in same way in PSI2FIR, see
`PsiRawFirBuilder.Visitor.toFirProperty`.
This fix now makes it possible to add test for functionality from
previous commit.
Review: KT-MR-12107
^KT-61784
Roman Efremov