better type check for mssql+ado binary null strip

better type check for mssql+ado binary null strip

The data_type in the t/lib result class for the blob for the tests
changed to 'blob', while the binary type null stripper only expected
'binary' or 'image' data types, which is wrong for possibly
cross-deployed schemas.

Change _strip_trailing_binary_nulls in ::ADO::CursorUtils to use the
newly added and more generic ::Storage::DBI::_is_binary_type instead of
just checking for 'binary' or 'image'.