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

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

@@ -31,29 +31,20 @@ export class DynamicDateTimeCombo extends Single {
         iconWidth: 24
     };
 
-    props = () => {
-        const date = getDate();
-        return {
-            baseCls: "bi-dynamic-date--time-combo",
-            height: 24,
-            minDate: "1900-01-01",
-            maxDate: "2099-12-31",
-            format: "",
-            allowEdit: true,
-            supportDynamic: true,
-            attributes: {
-                tabIndex: -1
-            },
-            isNeedAdjustHeight: false,
-            isNeedAdjustWidth: false,
-            value: {
-                type: DynamicDateTimeCombo.Static,
-                value: {
-                    year: date.getFullYear(),
-                    month: date.getMonth() + 1
-                }
-            }
-        };
+    props = {
+        baseCls: "bi-dynamic-date--time-combo",
+        height: 24,
+        minDate: "1900-01-01",
+        maxDate: "2099-12-31",
+        format: "",
+        allowEdit: true,
+        supportDynamic: true,
+        attributes: {
+            tabIndex: -1,
+        },
+        isNeedAdjustHeight: false,
+        isNeedAdjustWidth: false,
+        value: null,
     };
 
     static EVENT_KEY_DOWN = "EVENT_KEY_DOWN";