message-queue-item: remove signal disconnect for a signal we no longer connect to

7 jobs for master in 5 minutes and 19 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed fedora-asan #1342964
asan

00:03:10

passed fedora-autobahn-quick #1342962
ipv6

00:05:18

passed fedora-scan #1342963
ipv6

00:02:22

passed fedora-test #1342961
ipv6

00:02:00

83.9%
 
  Docs
passed reference #1342965

00:00:45

 
  Deploy
passed pages #1342966

00:01:14

passed pages:deploy

00:00:01