fix(plugin): 修复二维码插件black属性导致其他ui框架颜色错误问题

Author: Qiu-Jun

packages/core/plugin/QrCodePlugin.ts

@@ -69,11 +69,11 @@ class QrCodePlugin implements IPluginTempl {
       width: 300,
       margin: 10,
       errorCorrectionLevel: 'M',
-      dotsColor: 'black',
+      dotsColor: '#000000',
       dotsType: 'rounded',
-      cornersSquareColor: 'black',
+      cornersSquareColor: '#000000',
       cornersSquareType: 'square',
-      cornersDotColor: 'black',
+      cornersDotColor: '#000000',
       cornersDotType: 'square',
       background: '#ffffff',
     };