node tests: Fix false positive for muted user.
node tests: Fix false positive for muted user.

The test was passing here because we didn't add
selma. We want to make sure it's due to the actual
muting.

hackerkid/zulip,kou/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,zulip/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,punchagan/zulip,rht/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,kou/zulip,zulip/zulip,punchagan/zulip,rht/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,hackerkid/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,kou/zulip