add a slider for default value of added extra networks

extensions-builtin/Lora/ui_extra_networks_lora.py

@@ -1,3 +1,4 @@
+import json
 import os
 import lora
 
@@ -26,7 +27,7 @@ class ExtraNetworksPageLora(ui_extra_networks.ExtraNetworksPage):
                 "name": name,
                 "filename": path,
                 "preview": preview,
-                "prompt": f"<lora:{name}:1.0>",
+                "prompt": json.dumps(f"<lora:{name}:") + " + opts.extra_networks_default_multiplier + " + json.dumps(">"),
                 "local_preview": path + ".png",
             }