fix: Time format should not affect by Datetime format

Author: zombieJ

examples/basic.tsx

@@ -134,7 +134,12 @@ export default () => {
         </div>
         <div style={{ margin: '0 8px' }}>
           <h3>Uncontrolled Datetime</h3>
-          <Picker<Moment> generateConfig={momentGenerateConfig} locale={zhCN} />
+          <Picker<Moment>
+            format="YYYY-MM-DD HH:mm:ss"
+            generateConfig={momentGenerateConfig}
+            locale={enUS}
+            showTime
+          />
         </div>
         <div style={{ margin: '0 8px' }}>
           <h3>Week</h3>

src/panels/DatetimePanel/index.tsx

@@ -153,6 +153,7 @@ function DatetimePanel<DateType>(props: DatetimePanelProps<DateType>) {
       />
       <TimePanel
         {...props}
+        format={undefined}
         {...timeProps}
         {...disabledTimes}
         defaultValue={undefined}