Typo fix s/NotNullableBooleanInput/BooleanInput/
Typo fix s/NotNullableBooleanInput/BooleanInput/

As requested by @Kmaschta at https://github.com/marmelab/admin-on-rest/pull/52#discussion_r81340722
matteolc/admin-on-rest,marmelab/admin-on-rest,marmelab/admin-on-rest,matteolc/admin-on-rest