continuous keepalive when selected (or cacheex)now also ok for cs357x

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9794 4b0bc96b-bc66-0410-9d44-ebda105a78c1
revert 9791

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@9795 4b0bc96b-bc66-0410-9d44-ebda105a78c1