Fix for spline UI multisplines

Not sure why, but the indexing for the spline modifications was off.

Change-Id: I1b9e7345f5f25877ab974eea7f5df4630b1d71c7
diff --git a/frc971/control_loops/python/path_edit.py b/frc971/control_loops/python/path_edit.py
index ce87aff..f198299 100755
--- a/frc971/control_loops/python/path_edit.py
+++ b/frc971/control_loops/python/path_edit.py
@@ -326,7 +326,7 @@
         difs = np.array([pxToM(dif_x), pxToM(dif_y)])
 
         if self.mode == Mode.kEditing:
-            self.spline_edit = self.points.updates_for_mouse_move(
+            self.points.updates_for_mouse_move(
                 self.index_of_edit, self.spline_edit, self.x, self.y, difs)
 
     def export_json(self, file_name):
@@ -406,8 +406,7 @@
                 self.points.setSplines(self.spline_edit, self.index_of_edit,
                                        pxToM(self.x), pxToM(self.y))
 
-                self.spline_edit = self.points.splineExtrapolate(
-                    self.spline_edit)
+                self.points.splineExtrapolate(self.spline_edit)
 
                 self.index_of_edit = -1
                 self.spline_edit = -1