BI-131340 fix: DynamicDateTimeCombo的value默认值设置为null

packages/fineui/src/widget/dynamicdatetime/dynamicdatetime.combo.js

@@ -31,9 +31,7 @@ export class DynamicDateTimeCombo extends Single {
         iconWidth: 24
     };
 
-    props = () => {
-        const date = getDate();
-        return {
+    props = {
         baseCls: "bi-dynamic-date--time-combo",
         height: 24,
         minDate: "1900-01-01",
@@ -42,18 +40,11 @@ export class DynamicDateTimeCombo extends Single {
         allowEdit: true,
         supportDynamic: true,
         attributes: {
-                tabIndex: -1
+            tabIndex: -1,
         },
         isNeedAdjustHeight: false,
         isNeedAdjustWidth: false,
-            value: {
-                type: DynamicDateTimeCombo.Static,
-                value: {
-                    year: date.getFullYear(),
-                    month: date.getMonth() + 1
-                }
-            }
-        };
+        value: null,
     };
 
     static EVENT_KEY_DOWN = "EVENT_KEY_DOWN";