Fix reset issues with spatial audio

Fixes #962

Author: goldfire

src/plugins/howler.spatial.js

@@ -579,9 +579,22 @@
 
       // Reset all spatial plugin properties on this sound.
       self._orientation = parent._orientation;
+      self._stereo = parent._stereo;
       self._pos = parent._pos;
       self._pannerAttr = parent._pannerAttr;
 
+      // If a stereo or position was specified, set it up.
+      if (self._stereo) {
+        parent.stereo(self._stereo);
+      } else if (self._pos) {
+        parent.pos(self._pos[0], self._pos[1], self._pos[2], self._id);
+      } else if (self._panner) {
+        // Disconnect the panner.
+        self._panner.disconnect(0);
+        self._panner = undefined;
+        parent._refreshBuffer(self);
+      }
+
       // Complete resetting of the sound.
       return _super.call(this);
     };