Downloader: link preferred bitrate to JDA requested format.

src/main/java/moe/nekojimi/chords/Downloader.java

@@ -28,6 +28,7 @@ import javax.json.JsonArray;
 import javax.json.JsonObject;
 import javax.json.JsonReader;
 import moe.nekojimi.chords.Downloader.DownloadTask;
+import net.dv8tion.jda.api.audio.AudioSendHandler;
 
 /**
  *
@@ -40,7 +41,7 @@ public class Downloader implements Consumer<DownloadTask>
     private static final int INFO_TIMEOUT = 10;
     private static final int FORMAT_TIMEOUT = 5;
 
-    private static final int BITRATE_TARGET = 64_000;
+    private static final int BITRATE_TARGET = (int) AudioSendHandler.INPUT_FORMAT.getSampleRate();
     private static final Pattern FORMAT_PATTERN = Pattern.compile("^([\\w]+)\\s+([\\w]+)\\s+(\\w+ ?\\w*)\\s+(.*)$");
     public static final Pattern DESTINATION_PATTERN = Pattern.compile("Destination: (.*\\.wav)");