launcher: Remove spurious key focus grab of the filter entry.
launcher: Remove spurious key focus grab of the filter entry.

Every time the filter text changed we would again assign input
focus to the filter entry, which is superfluous.

Fixes: http://bugzilla.meego.com/show_bug.cgi?id=526

meego-netbook-ux/meego-panel-applications,meego-netbook-ux/meego-panel-applications