fix missing re-route

kaplayjs#331 / kaplayjs#335 implemented the panning but I just noticed that if the audio is paused/stopped/seeked the audio will stop going through the pan node

src/audio/play.ts

@@ -208,7 +208,7 @@ export function play(
         newNode.playbackRate.value = oldNode.playbackRate.value;
         newNode.detune.value = oldNode.detune.value;
         newNode.onended = oldNode.onended;
-        newNode.connect(gainNode);
+        newNode.connect(panNode);
         return newNode;
     };