fix bug

apps/classroom/Tpl/default/Index/search_w3g.html

@@ -176,7 +176,7 @@
                 -->
 
                 <div class="layout_h">
-                    <div v-if="item.price > 0" class="home_item_mark_green layout_center">付费</div>
+                    <div v-if="item.price > 0" class="home_item_mark_orange layout_center">付费</div>
                     <div v-if="item.price == 0" class="home_item_mark_green layout_center">免费</div>
                     <span class="text_14_600 color_333333 weight_full van-multi-ellipsis--l2" style="margin-left: 0.625rem;">{{item.title}}</span>
                     <div @click="onTapQuestion(item)" v-if="(item.price == 0 || item.is_buy) && item.hasQuestion > 0" class="home_button_green layout_center">开始做题</div>