modulemenu.js breaks livesearch "Show all" when already in list module
In modulemenu.js is a check for top.fsMod.recentIds, and if there is a hit for the requested section, an id param is prepended to the params, but without a & to concatenate the other params.
This results in e.g. such a url when performing a live search:
which won't show any results.
How to reproduce: open list module and click on a page, then do a live search and click the "Show all"-Button.
Do the same from another module or the welcome screen, and you get all results.
(issue imported from #M16487)