msc: expect TC_attached_imsi_lu_unknown_tmsi to pass

The "VLR evil twin" problem has been fixed in osmo-msc.git:

https://gerrit.osmocom.org/c/osmo-msc/+/36452
https://cgit.osmocom.org/osmo-msc/commit/?id=2fd69e15d36d5a8e87029741ad66632c57d24cd4

And the testcase is finally passing now.

Change-Id: I57a277fa7e6e0d10ff38e23f416ace87472e6602
Related: OS#4721
diff --git a/msc/expected-results.xml b/msc/expected-results.xml
index b6e0bb2..aad96a7 100644
--- a/msc/expected-results.xml
+++ b/msc/expected-results.xml
@@ -27,12 +27,7 @@
   <testcase classname='MSC_Tests' name='TC_lu_disconnect' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_by_imei' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_lu_by_tmsi_noauth_unknown' time='MASKED'/>
-  <testcase classname='MSC_Tests' name='TC_attached_imsi_lu_unknown_tmsi' time='MASKED'>
-    <failure type='fail-verdict'>Expected LU ACK, but received REJ
-      MSC_Tests.ttcn:MASKED MSC_Tests control part
-      MSC_Tests.ttcn:MASKED TC_attached_imsi_lu_unknown_tmsi testcase
-    </failure>
-  </testcase>
+  <testcase classname='MSC_Tests' name='TC_attached_imsi_lu_unknown_tmsi' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_imsi_detach_by_imsi' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_imsi_detach_by_tmsi' time='MASKED'/>
   <testcase classname='MSC_Tests' name='TC_imsi_detach_by_imei' time='MASKED'/>