Remove nonexistent option from sip.conf.sample.

The option to choose which connected line header to
use is not 'rpid_header' but 'sendrpid'



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@190577 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/sip.conf.sample

@@ -228,9 +228,6 @@ srvlookup=yes                   ; Enable DNS SRV lookups on outbound calls
                                 ; This is identical to sendrpid=yes
 ;sendrpid = pai                 ; Use the "P-Asserted-Identity" header
                                 ; to send the identity of the remote party
-;rpid_header = rpid             ; Which header should be used when sending Remote Party ID
-                                ; 'rpid' means to send "Remote-Party-ID"
-                                ; 'pai' means to send "P-Asserted-Identity"
 ;progressinband=never           ; If we should generate in-band ringing always
                                 ; use 'never' to never use in-band signalling, even in cases
                                 ; where some buggy devices might not render it