fix typo in `config/main` which was causing a single failed extension-load to break the rest of the page.
fix typo in `config/main` which was causing a single failed extension-load to break the rest of the page.

original-commit-id: f5149455ffa68300e18399279e6aef8c3a9724f3
original-commit-url: https://github.com/ipython-contrib/IPython-notebook-extensions/commit/f5149455ffa68300e18399279e6aef8c3a9724f3

jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator,jcb91/jupyter_nbextensions_configurator