style(marketingEdit): 调整图层面板和编辑器位置及高度

- 增加图片编辑器图层面板的高度从260px到410px
- 下移营销编辑器添加动作区域的位置从top:350px到top:500px
- 移除图层面板标题下的副标题文字"选中 / 预览 / 排序 / 删除"

frontend/src/views/components/PictureEditor/mixin/layer/index.scss

@@ -3,7 +3,7 @@
   top: 85px;
   left: 0;
   width: 210px;
-  height: 260px;
+  height: 410px;
   background: #ffffff;
   color: #222;
   padding: 8px 10px;

frontend/src/views/components/marketingEdit/index.vue

@@ -559,7 +559,7 @@ export default {
 
   .add-action-wrap {
     position: fixed;
-    top:350px;
+    top:500px;
     overflow: auto;
     left: 0px;
     z-index: 10;

frontend/src/views/components/marketingEdit/tpl/layer.js

@@ -3,7 +3,6 @@ export default function() {
     <div class="picture-editor-wrap_layer layer-panel">
       <div class="layer-panel__header">
         <div class="layer-panel__title">图层</div>
-        <div class="layer-panel__sub">选中 / 预览 / 排序 / 删除</div>
       </div>
       <template v-if="layers.length > 0">
         <div class="layer-panel__list">