Remove serialreadertimeout setting.

It not used to set serial reader timeouts. It was actually used
to limit clienttimeout and fallbacktimeout but if you didn't compile
module-serial in, you can't even set serialreadertimeout in webif.

Patch by blaky. This fixes ticket #3186.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8516 4b0bc96b-bc66-0410-9d44-ebda105a78c1