fix(DatePicker): panel top arrow doesn't work when using week mode

Author: RSS1102

src/date-picker/DateRangePickerPanel.tsx

@@ -135,7 +135,13 @@ export default defineComponent({
         prev: 'arrow-previous',
         next: 'arrow-next',
       };
-      const monthCountMap = { date: 1, month: 12, year: 120 };
+      const monthCountMap = {
+        date: 1,
+        week: 1,
+        month: 12,
+        quarter: 12,
+        year: 120,
+      };
       const monthCount = monthCountMap[props.mode] || 0;
       const current = new Date(year.value[partialIndex], month.value[partialIndex]);