fix(ImageClipper): 修复 canvas 2d 导致的无法绘制图片问题

close #1156

Author: murongg

src/image-clipper/index.wxml

@@ -46,13 +46,7 @@
             style="width: {{imageWidth ? imageWidth + 'px' : 'auto'}};height: {{imageHeight ? imageHeight + 'px' : 'auto'}};transform: translate3d({{imageLeft - imageWidth / 2}}px, {{imageTop - imageHeight / 2}}px,0) scale({{scale}}) rotate({{angle}}deg); transition-duration: {{cutAnimation ? 0.35 : 0}}s;" 
         />
         <!-- 图片绘制容器 -->
-        <!-- 
-            refactor: 
-                canvas 2d 接口支持同层渲染且性能更佳，建议切换使用。
-                详见文档：https://developers.weixin.qq.com/miniprogram/dev/component/canvas.html#Canvas-2D-%E7%A4%BA%E4%BE%8B%E4%BB%A3%E7%A0%81 
-        -->
         <canvas
-            type="2d"
             canvas-id="image-clipper"
             id="image-clipper"
             :disable-scroll="true"