临时解决音频设置playbackRate不生效的问题

(cherry picked from commit 622baff7)

pages/API/create-inner-audio-context/create-inner-audio-context.uvue

@@ -154,7 +154,6 @@
 				this._isChanging = true;
 			},
 			onchange(e : UniSliderChangeEvent) {
-				
 				let pos = e.detail.value;
 				console.log('pos', pos);
 				this._audioContext!.seek(pos);
@@ -277,7 +276,7 @@
 			playbackRateChange(e : UniRadioGroupChangeEvent) {
 				if (this._audioContext != null && this.isPlaying) {
 					console.log(parseFloat(e.detail.value))
-					this._audioContext!.playbackRate = parseFloat(e.detail.value)
+					this._audioContext!.playbackRate = parseFloat(e.detail.value).toDouble()
 				}
 			},
 		}