Fixed a bug in lexical const lookup
Fixed a bug in lexical const lookup

I actually have no idea what the bugis, but the handling of `object_seen` looks "obviously wrong" to me.  It will never be the case that we hit `fallback_scope = None` because that currently requires `w_mod is self.w_basicobject` and `object_seen`. `object_seen = w_mod is self.w_object`. By substitution that means `w_mod is self.w_basicobject and w_mod is self.w_object` which is trivially false.

The fix I propose here makes intuitive sense to me, but I haven't event attempted to run this code.
topazproject/topaz,topazproject/topaz,topazproject/topaz,topazproject/topaz