fix: 【我的素材】搜索框placeholder不需要“文件夹”

src/views/material/audio/index.vue

@@ -34,7 +34,7 @@
           <input
             type="text"
             v-model="searchKey"
-            placeholder="搜索文件夹或素材"
+            placeholder="搜索素材"
           />
           <i v-if="searchKey" @click="searchKey=''" class="iconfont icontoast_red del"></i>
         </div>

src/views/material/image/index.vue

@@ -33,7 +33,7 @@
           <input
             type="text"
             v-model="searchKey"
-            placeholder="搜索文件夹或素材"
+            placeholder="搜索素材"
           />
           <i v-if="searchKey" @click="searchKey=''" class="iconfont icontoast_red del"></i>
         </div>

src/views/material/pano/index.vue

@@ -33,7 +33,7 @@
           <input
             type="text"
             v-model="searchKey"
-            placeholder="搜索文件夹或素材"
+            placeholder="搜索素材"
           />
           <i v-if="searchKey" @click="searchKey=''" class="iconfont icontoast_red del"></i>
         </div>