remove newcall softkey from connected softkey set

When the newcall softkey is there, the 7905, 7906, 7911 and 7912 don't
display the "monitor/grplisten" softkey and displays the "messages"
softkey, two things that are incorrect.

Note that the newcall softkey is also not present in the connected
softkey set of a Cisco CME.
Merge branch 'master' into move

Conflicts:
	xivo-libsccp/src/sccp_device.h