Fix phx base

[sing-gor]

Hi Mr.Moore.
I found a bug.
When I use mix phx.gen.html <Any> generate html/controller/view and schema.

In the Old Code ,if i click the Save button, that will have two flashes and redirect to the index page :

• "Article created successfully".
• "You're not authorized to do that!"

Because the action of show is missing.