Transfer: fix incorrect line-height of el-transfer's first list item when it was used with el-form-item (#18917)

packages/theme-chalk/src/transfer.scss

@@ -96,11 +96,10 @@
     height: $--transfer-item-height;
     line-height: $--transfer-item-height;
     padding-left: 15px;
-    display: block;
+    display: block !important;
 
     & + .el-transfer-panel__item {
       margin-left: 0;
-      display: block!important;
     }
 
     &.el-checkbox {