always derive type from element in annotated case

always derive type from element in annotated case

Fixed issue where use of :func:`_orm.foreign` annotation on a
non-initialized :func:`_orm.mapped_column` construct would produce an
expression without a type, which was then not updated at initialization
time of the actual column, leading to issues such as relationships not
determining ``use_get`` appropriately.

Fixes: #10597
Change-Id: I8339ba715ec6bd1f50888f8a424c3ac156e2364f