Fix the integration test

IRCv3 capabilities broke it a bit.

Also change it so that it doesn't destroy existing configuration.

test

@@ -1,5 +1,7 @@
 #!/usr/bin/expect -f
 # Very basic end-to-end testing for CI
+set tempdir [exec mktemp -d]
+set ::env(XDG_CONFIG_HOME) $tempdir
 
 # Run the daemon to test against
 system ./xD --write-default-cfg
@@ -27,7 +29,7 @@ expect "Option changed"
 send "/disconnect\n"
 expect "]"
 send "/connect\n"
-expect "Connection established"
+expect "Welcome to"
 
 # Try some chatting
 send "/join #test\n"