fix: 新建数据源时，驱动选项无法选择上

frontend/src/views/system/datasource/DsForm.vue

@@ -285,7 +285,8 @@ export default {
         maxIdleTime: 30,
         acquireIncrement: 5,
         idleConnectionTestPeriod: 5,
-        connectTimeout: 5
+        connectTimeout: 5,
+      customDriver: ''
       }
 
     },