Fix app controller

`with: :exception` is misplaced. It is generating this controller:

```
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery
  ensure_security_headers # See more: https://github.com/twitter/secureheaders
 with: :exception
end
```

It was supposed to generate this:
```
class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception
  ensure_security_headers # See more: https://github.com/twitter/secureheaders
end
```