update left/right icon not align to center (#2958)

src/design/ant/index.less

@@ -8,7 +8,7 @@
   }
 }
 
-span.anticon:not(.app-iconify, .anticon-vertical-align-top, .anticon-bell) {
+span.anticon:not(.app-iconify, .anticon-vertical-align-top, .anticon-bell, .anticon-left, .anticon-right) {
   vertical-align: 0.125em !important;
 }