fix(接口定义): 修复场景变量批量添加冒号被截断的缺陷

--bug=1018059 --user=王孝刚 【接口测试】场景变量批量添加，多个冒号的会被截断
https://www.tapd.cn/55049933/s/1262153

api-test/frontend/src/business/automation/scenario/variable/VariableList.vue

@@ -314,12 +314,12 @@ export default {
         params.forEach(item => {
           if (item) {
             let line = item.split(/：|:/);
+            let values = item.split(line[0] + ":");
             let required = false;
             keyValues.push(new KeyValue({
               name: line[0],
               required: required,
-              value: line[1],
-              description: line[2],
+              value: values[1],
               type: "CONSTANT",
               valid: false,
               file: false,