[Improvement] ContactCard add 'editable' prop (#435)

packages/vant-css/src/contact-card.css

@@ -8,6 +8,12 @@
     background-color: $active-color;
   }
 
+  &--uneditable {
+    &:active {
+      background-color: $white;
+    }
+  }
+
   &--add {
     line-height: 40px;