MT#56015 no need to check sdp description

SDP description check has been removed for invite_voicebox scenario
because not important and a upgrade of asterisk may lead to
kct failing.

Change-Id: Iac15edc08ec534a177658106b24f2d171474448b

scenarios/invite_voicebox/sipp_scenario00_test.yml.tt2

@@ -32,7 +32,6 @@ messages:
   - 'Contact: <sip:ngcp-lb@[% server_ip %]:5060;ngcpct=[^;]+>'
   - 'v=0'
   - 'o=root \d+ \d+ IN IP4 [% server_ip %]'
-  - 's=Asterisk PBX 16.16.1~dfsg-1'
   - 'c=IN IP4 [% server_ip %]'
   - 't=0 0'
   - 'm=audio \d+ RTP/AVP 8'