Call setSilent for notifications that should not make noise

It's a new-ish API, added in 1.5.0 as a replacement for
`setNotificationSilent`, added in 1.3.0 (2020), which is doing the same.

Closes #529

app/src/main/java/com/ubergeek42/WeechatAndroid/notifications/Notificator.kt

@@ -552,6 +552,8 @@ private fun NotificationCompat.MessagingStyle.maybeAddMissingMessageLine(
 private fun NotificationCompat.Builder.setMakeNoise(makeNoise: Boolean): NotificationCompat.Builder {
     setOnlyAlertOnce(!makeNoise)
 
+    if (!makeNoise) setSilent(true)
+
     if (makeNoise && Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
         var flags = 0
         if (P.notificationLight) flags = flags or Notification.DEFAULT_LIGHTS