Remove overzealous tooltips in issues project subnavigation
Similar to: https://gitlab.com/gitlab-org/gitlab-ce/issues/35658 ![2017-10-23_15.18.14](/uploads/619a533f748af60a7847a4098118c6b8/2017-10-23_15.18.14.gif) ![2017-10-23_15.22.26](/uploads/d9cfc232715f43766bbf4189a79535af/2017-10-23_15.22.26.gif)
issue