Fix: KEYMODE_OFFHOOKFEAT when KEYMODE_OFFHOOK is requested during Transfer on protocolversion 22 phones (Which should include 69XX). Not sure if this should be specific for 69XX phones or if protoversion 22 phones in general need this keymode. (Reported by Antonio).

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5606 43c1dc8c-776e-4df2-8ef1-6e829299be21