reducing the ongoing call notification importance to avoid playing the audio

app/src/main/kotlin/com/simplemobiletools/contacts/pro/services/DialerCallService.kt

@@ -46,7 +46,7 @@ class DialerCallService : Service() {
         if (isOreoPlus()) {
             val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
             val name = resources.getString(R.string.app_name)
-            val importance = NotificationManager.IMPORTANCE_DEFAULT
+            val importance = NotificationManager.IMPORTANCE_LOW
             NotificationChannel(channelId, name, importance).apply {
                 enableLights(false)
                 enableVibration(false)