Enable test accessing Component's Parent property in LINQ

[bahusoid]

#1583 test case works OK with NHibernate 5.3+

Generated SQL also looks valid:

    select
        children1_.ParentId as col_0_0_ 
    from
        Parent parent0_ 
    inner join
        Children children1_ 
            on parent0_.ParentId=children1_.ParentId

Closes #1583

[hazzik]

I wonder what has fixed the behaviour:)

[bahusoid]

Not sure but might be #2036 where some complex logic was introduced that tries to correctly detect mapped type for LINQ expression