fix: Remove not existing attribute

Making a prediction generate this error:
AttributeError: type object 'Button' has no attribute 'update'.
The call to the method "update" was removed.

ChatApp/app_modules/utils.py

@@ -208,7 +208,7 @@ def transfer_input(inputs):
     return (
         inputs,
         gr.update(value=""),
-        gr.Button.update(visible=True),
+        gr.Button(visible=True),
     )