Comment 2 for bug 1192081

According to https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1189088, we will revert to the old behavior for applications scope results (left-click activates installed apps immediately). The performance of app previews is the same as in 13.04, but since app previews will only be displayed on right-click again, this is no longer a critical problem, thus lowering its severity.