Also move the remaining get_params to get_executed_params

Remove the class's get_params entirely, because it is apparently not needed and contained a funny return.

jedi/evaluate/context/function.py

@@ -246,5 +246,5 @@ class FunctionExecutionContext(TreeContext):
                                              origin_scope=origin_scope)
 
     @evaluator_method_cache()
-    def get_params(self):
+    def get_executed_params(self):
         return self.var_args.get_executed_params(self)