Revert "Don't include the "simple" bit in O65_MODE_CC65 (.o65 mode word for modules)."

This reverts commit f821e3c8be2275f553db10f85026950b32c1caac.
Revert "Ignore "simple" bit when checking .o65 mode word."

This reverts commit e838c81fcc6a07f754f82023493762b25d404cdd.