Fix padding for mini Tag without close

packages/theme-chalk/src/tag.scss

@@ -135,7 +135,7 @@
 
   @include m(mini) {
     height: 20px;
-    padding: 0 5px 0 8px;
+    padding: 0 5px;
     line-height: 19px;
 
     .el-icon-close {