Revert "Fix sudoers.d inclusion on debian img (fix #394)"

This reverts commit 4b3b6697.

base-notebook/start.sh

@@ -28,8 +28,6 @@ if [ $UID == 0 ] ; then
 
     # Enable sudo if requested
     if [ ! -z "$GRANT_SUDO" ]; then
-        # Ensure includedir sudoers.d is not commented
-        sed -i -E 's|^#(includedir /etc/sudoers.d.*)|\1|g' /etc/sudoers
         echo "$NB_USER ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/notebook
     fi