fix: remove position reset of Orbit slides preventing the "full-absolute" new behavior

fix: remove position reset of Orbit slides preventing the "full-absolute" new behavior

All Orbit slides should always have an `absolute` positioning to prevent jumping Orbit slider (see #11107). The `'position': 'relative'` reset is no longer necessary here and break the Orbit behavior as inline styles overrides `.orbit-slide` class styles.

See:
* https://github.com/zurb/foundation-sites/pull/11107/commits/dbdae96312bcccd0820d8ee43c088d5d6a1fab14
* https://github.com/zurb/foundation-sites/pull/11107