feat(QRCode): add t-class-canvas (#3956)

* feat(QRCode): add t-class-canvas

* chore: remove unused code

Author: anlyyao

packages/components/qrcode/components/qrcode-canvas/qrcode-canvas.wxml

@@ -1 +1 @@
-<canvas type="2d" class="t-qrcode__canvas" id="qrcodeCanvas"></canvas>
+<canvas type="2d" class="t-qrcode__canvas class" id="qrcodeCanvas"></canvas>

packages/components/qrcode/components/qrcode-status/qrcode-status.wxml

@@ -1,5 +1,5 @@
 <block wx:if="{{statusRender}}">
-  <slot name="statusRender" status="{{status}}"> </slot>
+  <slot name="statusRender" />
 </block>
 
 <block wx:else>

packages/components/qrcode/qrcode.ts

@@ -7,7 +7,7 @@ const name = `${prefix}-qrcode`;
 
 @wxComponent()
 export default class QRCode extends SuperComponent {
-  externalClasses = [`${prefix}-class`];
+  externalClasses = [`${prefix}-class`, `${prefix}-class-canvas`];
 
   options = {
     multipleSlots: true,

packages/components/qrcode/qrcode.wxml

@@ -2,10 +2,11 @@
 
 <view
   style="{{_._style([style, customStyle])}} width:{{size}}px; height: {{size}}px; background-color: {{bgColor}};"
-  class="{{classPrefix}} {{borderless ? prefix+'-'+'borderless' : ''}} {{prefix}}-class"
+  class="{{classPrefix}} {{borderless ? prefix+'-'+'borderless' : ''}} class {{prefix}}-class"
 >
   <qrcode-canvas
     id="qrcodeCanvas"
+    class="{{prefix}}-class-canvas"
     size="{{size}}"
     value="{{value}}"
     level="{{level}}"