修复在手机端预览时，侧边菜单样式问题。 (#3225)

#3224  @sorrycc

src/components/SiderMenu/index.less

@@ -88,4 +88,9 @@
     transition: opacity 0.3s @ease-in-out, width 0.3s @ease-in-out;
     opacity: 1;
   }
+  .ant-drawer-left {
+    .ant-drawer-body {
+      padding: 0;
+    }
+  }
 }