Avoid dynamic params search for Interpreter, fixes #1899

jedi/inference/dynamic_params.py

@@ -66,11 +66,11 @@ def dynamic_param_lookup(function_value, param_index):
     have to look for all calls to ``func`` to find out what ``foo`` possibly
     is.
     """
-    funcdef = function_value.tree_node
-
-    if not settings.dynamic_params:
+    if not function_value.inference_state.do_dynamic_params_search:
         return NO_VALUES
 
+    funcdef = function_value.tree_node
+
     path = function_value.get_root_context().py__file__()
     if path is not None and is_stdlib_path(path):
         # We don't want to search for references in the stdlib. Usually people