Bug in 45.state-management sample

[rvinothrajendran]

To create the user profile property , it should refer the UserState but in the sample its referring the
conversationstate.

Current code : self.user_profile = self.conversation_state.create_property("UserProfile")

Expected code : self.user_profile = self.user_state.create_property("UserProfile")

[tracyboehrer]

Thanks! Pushing a fix to master shortly.