Fix T45495: Armatures using the iTaSC IK solver causes UI truncation in bone constraints panel.

Caused by rB404f9ddc37fc, cleanup is OK but please double-check changes before committing. :(

release/scripts/startup/bl_ui/properties_constraint.py

@@ -72,7 +72,7 @@ class ConstraintButtonsPanel:
                 layout.prop_search(con, "subtarget", con.target, "vertex_groups", text="Vertex Group")
 
     @staticmethod
-    def ik_template(self, layout, con):
+    def ik_template(layout, con):
         # only used for iTaSC
         layout.prop(con, "pole_target")