fix: corrected index access in d_from_pkaiews call

- Fixed incorrect static index in `wlpf.py` by replacing it with a dynamic access using `self._start_k2`.

Author: hpparvi

exoiris/wlpf.py

@@ -128,7 +128,7 @@ def transit_duration(self):
         pv = self._local_minimization.x
         a = as_from_rhop(pv[1], pv[0])
         i = i_from_ba(pv[2], a)
-        t14 = d_from_pkaiews(pv[0], sqrt(pv[4]), a, i, 0., 0., 1, 14)
+        t14 = d_from_pkaiews(pv[0], sqrt(pv[self._start_k2]), a, i, 0., 0., 1, 14)
         return t14
 
     def plot(self, axs=None, figsize=None, ncols=2) -> Figure: