Create "UserProfile" property in user_state (microsoft#2146)

The "UserProfile" property was created in the conversation state, though it should be in the user state, as it is in C# and JS samples.

samples/python/44.prompt-for-user-input/bots/custom_prompt_bot.py

@@ -41,7 +41,7 @@ def __init__(self, conversation_state: ConversationState, user_state: UserState)
         self.user_state = user_state
 
         self.flow_accessor = self.conversation_state.create_property("ConversationFlow")
-        self.profile_accessor = self.conversation_state.create_property("UserProfile")
+        self.profile_accessor = self.user_state.create_property("UserProfile")
 
     async def on_message_activity(self, turn_context: TurnContext):
         # Get the state properties from the turn context.