fix(tag): 设置按钮字号 (#2430)

Author: oasis-cloud

src/packages/tag/tag.harmony.css

@@ -52,6 +52,7 @@
   display: inline-flex;
   align-items: center;
   justify-content: center;
+  font-size: 10px;
 }
 .nut-tag-plain {
   background-color: #fff;

src/packages/tag/tag.scss

@@ -66,6 +66,7 @@
     display: inline-flex;
     align-items: center;
     justify-content: center;
+    font-size: $tag-font-size;
   }
 
   &-plain {

src/packages/tag/tag.taro.tsx

@@ -145,6 +145,7 @@ export const Tag: FunctionComponent<Partial<TagProps>> = (props) => {
                   setVisible(false)
                   onClose && onClose(e)
                 }}
+                className={`${classPrefix}-custom-icon`}
               >
                 X
               </Text>