Notification: Rework priority and position of sender, summary, and body

Specifically, put the summary in the sender position when sender is blank

notifs.go

@@ -81,12 +81,13 @@ func initNotifRelay(ctx context.Context, dev *infinitime.Device) error {
 			body = translit.Transliterate(body, maps...)
 
 			var msg string
-			// If summary does not exist, set message to body.
+			msg = body
-			// If it does, set message to summary, two newlines, and then body
+			// If sender doesn't exist, use summary
-			if summary == "" {
+			if sender == "" {
-				msg = body
+				sender = summary
-			} else {
+			// if all three exist, set message to summary and body
-				msg = fmt.Sprintf("%s\n\n%s", summary, body)
+			} else if summary != "" {
+				msg = fmt.Sprintf("%s\n%s", summary, body)
 			}
 
 			dev.Notify(sender, msg)