Remove Hobbit::AssetTag module from the application controller

Hi @patriciomacadden, due to Hobbit::AssetTag [has been removed] from hobbit-contrib is necessary to remove the requirement of the module in the application controller

[has been removed]:https://github.com/patriciomacadden/hobbit-contrib/commit/750ecfb47d37dc58450ded1878fbd16777efcf4e