[bugfix] ContactList: button position wrong (#2634)

packages/contact-list/index.js

@@ -19,6 +19,7 @@ export default sfc({
       <div class={bem()}>
         <RadioGroup
           value={this.value}
+          class={bem('group')}
           onInput={event => {
             this.$emit('input', event);
           }}

packages/contact-list/index.less

@@ -2,7 +2,7 @@
 
 .van-contact-list {
   height: 100%;
-  padding-bottom: 65px;
+  padding-bottom: 50px;
   box-sizing: border-box;
 
   .van-cell {
@@ -34,7 +34,6 @@
   &__group {
     height: 100%;
     overflow-y: scroll;
-    padding-bottom: 100px;
     box-sizing: border-box;
     -webkit-overflow-scrolling: touch;
   }