require 'action_view/railtie' for pro compatibility

MSP-10848

Other railties, like jquery-rails, need 'action_view/railtie', but don't
require it themselves, so require it explictly in
`config/application.rb` to prevent msfconsole boot errors.
Merge pull request #3615 from limhoff-r7/bug/MSP-10848/nightly-msfconsole

require 'action_view/railtie' for pro compatibility