refactor: Remove redundant exit pupil location calculation in Paraxial class

Author: HarrisonKramer

optiland/paraxial.py

@@ -172,17 +172,10 @@ def XPL(self):
             float: exit pupil location relative to the image surface
         """
         stop_index = self.surfaces.stop_index
-        num_surfaces = len(self.surfaces.surfaces)
-        if stop_index == num_surfaces-2:
-            positions = self.optic.surface_group.positions
-            loc_relative = positions[-2] - positions[-1]
-            return loc_relative[0]
-
         z_start = self.surfaces.positions[stop_index]
         wavelength = self.optic.primary_wavelength
         y, u = self._trace_generic(0.0, 0.1, z_start, wavelength,
                                    skip=stop_index+1)
-
         loc_relative = -y[-1] / u[-1]
         return loc_relative[0]