fix: rich-text img标签兼容web端

pages/component/rich-text/rich-text-tags.uvue

@@ -290,8 +290,8 @@
                 name: 'img',
                 attrs: {
                   src: 'https://web-assets.dcloud.net.cn/unidoc/zh/uni@2x.png',
-                  width: '100px',
-                  height: '100px'
+                  width: '100',
+                  height: '100'
                 }
               }
             ] as Array<UTSJSONObject>