Always include @sheacraigs jss repos to popular repos list.

This is minimal, due to a number of other related changes in the 1.2-alpha branch.  I'll put a more robust feature into that release, that will either only add the repo to the list if jss-autopkg-addon is installed. Or perhaps better yet, if a .jss Recipe is selected and the add-on is not installed, it will prompt for installation.