[applets/kickoff] Remove "Switch tabs on hover" option
This option confuses people into believing that it applies to the category sidebar, but it does not: it only applies to the tabs below or above it (strike 1). It is off by default (strike two), and if you turn it on, it worsens usability by making it easier to accidentally switch tabs while moving the mouse over to an app you want to click on (strike 3). There is no conceivable use case that is improved by turning it on.
3 strikes and you're out, so let's remove this option. :)