Revert 3e918521b7abd83c7513df6e3ae849829d3b35e5

Due to fixes upstream in
https://github.com/twosigma/beaker-notebook/commit/2a183d176a1b13b45a27378a41c06c9ae45bffdb#diff-2ef84ec0d988e73f490e47e621cd85fcR318