Fix support for PostGIS-3.2+ directed linear TopoGeometries

References #57419
Lacks testcase

src/providers/postgres/qgspostgresfeatureiterator.cpp

@@ -542,7 +542,7 @@ QString QgsPostgresFeatureIterator::whereClauseRect()
         FROM %3.relation r, elems e
         WHERE r.layer_id = %4
           AND r.element_type = e.typ
-          AND r.element_id = e.id
+          AND ( r.element_id = e.id OR r.element_id = -e.id )
       )
     )SQL" )
                   // Should we bother with mBoundingBoxColumn ?