bugfix: hide "all apps" view when search starts

Fixes an issue where apps from "all apps" view can still be launched
after search results are visible; which can cause a different app to be
launched when tapped on a search result, or unexpected app launches when
tapped on empty space (below search results).

Testing:
1. open app drawer and search for anything
2. quickly tap on a search result or empty space
3. if tapped on one of the search results, correct app is launched; if
   tapped on the empty space, no app is launched
1 file changed