PLT-3734 Cleaning up shouldSendEvent function (#4024)

* PLT-3734 Cleaning up shouldSendEvent function

* Fix LHS unread highlight and jewel mentions

api/post_test.go

@@ -837,7 +837,7 @@ func TestMakeDirectChannelVisible(t *testing.T) {
 
 	channel := Client.Must(Client.CreateDirectChannel(user2.Id)).Data.(*model.Channel)
 
-	makeDirectChannelVisible(team.Id, channel.Id)
+	makeDirectChannelVisible(channel.Id)
 
 	if result, err := Client.GetPreference(model.PREFERENCE_CATEGORY_DIRECT_CHANNEL_SHOW, user2.Id); err != nil {
 		t.Fatal("Errored trying to set direct channel to be visible for user1")