add default_overwrite_step handling for meta data and gradio

allows turbo preset switching to set default_overwrite_step correctly

modules/meta_parser.py

@@ -118,6 +118,14 @@ def load_parameter_button_click(raw_prompt_txt):
     except:
         results.append(gr.update())
 
+    try:
+        h = loaded_parameter_dict.get('Sampling Steps Override', None)
+        assert h is not None
+        h = float(h)
+        results.append(h)
+    except:
+        results.append(gr.update())
+
     try:
         h = loaded_parameter_dict.get('Seed', None)
         assert h is not None