Fixed overriding __slots__ in atests after fixing __slots__ earlier.
Fixed overriding __slots__ in atests after fixing __slots__ earlier.

ldtri0209/robotframework,waldenner/robotframework,ldtri0209/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework,fiuba08/robotframework,fiuba08/robotframework,waldenner/robotframework,waldenner/robotframework,ldtri0209/robotframework,fiuba08/robotframework,waldenner/robotframework,fiuba08/robotframework,ldtri0209/robotframework