always use the API-only controller for all requests.

this change is needed to support my leap_web feature/new-ui pull request.

the version of srp_js that is used in feature/new-ui, however, is the current master, which does not work with feature/new-ui.

i do not know how to issue a pull request that has a submodule for another repo that doesn't yet exist. seems impossible. another reason i fucking hate submodules and think they should be avoided like the plague.