Suppress warning from actionview controller helper.

[xtina-starr]

Since the commit 3cb7fe5, ActionView :: Helpers::ControllerHelper started showing a warning(see below) because of the * operator. This commit changes the delegate call to use parentheses so it won't show warnings any more.

/Users/artsy/Artsy/oss/rails/actionview/lib/action_view/helpers/controller_helper.rb:14: warning: `*' interpreted as argument prefix

[rails-bot]

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