Fix has_table() false negative for #temp tables

Fix has_table() false negative for #temp tables

Fixed issue with :meth:`.Inspector.has_table` where it would return False
if a local temp table with the same name from a different session happened
to be returned first when querying tempdb.  This is a continuation of
:ticket:`6910` which accounted for the temp table existing only in the
alternate session and not the current one.

Fixes: #7168
Change-Id: I19dbb71a63184c6d41822b0e882b7b284ac83786