Input: fix show-word-count style in el-form (ElemeFE#15359)

Author: lvjiaxuan

packages/theme-chalk/src/input.scss

@@ -97,6 +97,7 @@
 
     .el-input__count-inner {
       background: $--color-white;
+      line-height: initial;
       display: inline-block;
       padding: 0 5px;
     }