fix: update model type in ModelSelect component to ITV and TTV

--bug=1062096 --user=王孝刚 【应用编排】在文生视频组件的模型下拉框中点添加模型按钮，弹框中默认的模型类型是图片生成 https://www.tapd.cn/62980211/s/1777699

Author: wxg0103

ui/src/workflow/nodes/image-to-video/index.vue

@@ -50,7 +50,7 @@
             "
             :options="modelOptions"
             showFooter
-            :model-type="'TTI'"
+            :model-type="'ITV'"
           ></ModelSelect>
         </el-form-item>
 

ui/src/workflow/nodes/text-to-video/index.vue

@@ -50,7 +50,7 @@
             "
             :options="modelOptions"
             showFooter
-            :model-type="'TTI'"
+            :model-type="'TTV'"
           ></ModelSelect>
         </el-form-item>