Simplify default displayname template

example-config.yaml

@@ -103,7 +103,7 @@ bridge:
     # The following variables are also available, but will cause problems on multi-user instances:
     # {{.FullName}}  - full name from contact list
     # {{.FirstName}} - first name from contact list
-    displayname_template: "{{if .BusinessName}}{{.BusinessName}}{{else if .PushName}}{{.PushName}}{{else}}{{.JID}}{{end}} (WA)"
+    displayname_template: "{{or .BusinessName .PushName .JID}} (WA)"
     # Should the bridge create a space for each logged-in user and add bridged rooms to it?
     # Users who logged in before turning this on should run `!wa sync space` to create and fill the space for the first time.
     personal_filtering_spaces: false