MT#62341 Typo on sanity scenario

In this scenario, kamailio proxy is returning this reply
in one of the test:

SIP/2.0 400 Ivalid To Header
Via: SIP/2.0/UDP 10.20.29.2:51602;branch=z9hG4bK-195953-1-4;rport=51602
From: <sip:testuser1003@sanity.scenarios.test>;tag=195953SIPpTag001
To: 500;tag=244d833d81f839382236e956655c48a4.bef88c60
Call-ID: NGCP%sanity%///1-195953@10.20.29.2
CSeq: 3 REGISTER
Server: Sipwise NGCP LB trunk
Content-Length: 0

The word "Ivalid" is a typo from upstram kamailio.
At the time of writing this commit message I issued a PL
on github:

e13bc796db

Since I do not know when and if it will be accepted, I am changing the kct test in order
to accept also the word "Ivalid".

Change-Id: Ie51030fd0eca56d98a3ffbb40be0fae5260b293b

scenarios/sanity/sipp_scenario00_test.yml.tt2

@@ -11,7 +11,7 @@ messages:
   - 'CSeq: \d+ REGISTER'
   - 'Server: Sipwise NGCP LB'
   - 'Content-Length:\s+0'
-- - 'SIP/2.0 400 Invalid To Header'
+- - 'SIP/2.0 400 I[n]?valid To Header'
   - 'From: <sip:[% scenarios.0.responders.0.username %]@sanity.scenarios.test>;tag=[\w-]+'
   - 'To: 500;tag=[\w-]+'
   - 'CSeq: \d+ REGISTER'