[BUG]: star_1.spin_orbit_tilt_second_SN's range is defined differently from other tilts.

[ZepeiX]

Describe the bug

star_1.spin_orbit_tilt_second_SN is calculated based on star_1.spin_orbit_tilt_first_SN and star_2.spin_orbit_tilt_second_SN. The latter two is defined in [-pi, pi] but the former is in [0, pi]

Expected behavior
The sign of star_1.spin_orbit_tilt_first_SN and star_2.spin_orbit_tilt_second_SN is needed when calculating star_1.spin_orbit_tilt_second_SN. But the sign is then not important for the final output of the star1 and star2 tilt. We ether put efforts to figure out the sign of star_1.spin_orbit_tilt_first_SN ([-pi, pi]), or simply output the absolute values ([0, pi]).