Pose Library: remove unused function

Remove `PoseActionCreator._store_parameters_from_callback()`, as it doesn't
have any current use.

No functional changes.

pose_library/pose_creation.py

@@ -98,7 +98,6 @@ class PoseActionCreator:
         """Store the current pose into the given action."""
         self._store_bone_pose_parameters(dst_action)
         self._store_animated_parameters(dst_action)
-        self._store_parameters_from_callback(dst_action)
 
     def _store_bone_pose_parameters(self, dst_action: Action) -> None:
         """Store loc/rot/scale/bbone values in the Action."""
@@ -146,13 +145,6 @@ class PoseActionCreator:
             dst_fcurve.keyframe_points.insert(self.params.src_frame_nr, value=value)
             dst_fcurve.update()
 
-    def _store_parameters_from_callback(self, dst_action: Action) -> None:
-        """Store extra parameters in the pose based on arbitrary callbacks.
-
-        Not implemented yet, needs a proper design & some user stories.
-        """
-        pass
-
     def _store_location(self, dst_action: Action, bone_name: str) -> None:
         """Store bone location."""
         self._store_bone_array(dst_action, bone_name, "location", 3)