don't load the kcm if we just ask for the minimumsize cause it renders the whole logic of the proxy invalid.
this removes e.g. the ~10 seconds delay on calling 'Configure Konqueror'

see also <a href="http://lists.kde.org/?l=kde-core-devel&m=122835969412478&w=2">http://lists.kde.org/?l=kde-core-devel&m=122835969412478&w=2</a>;