修复日期选择器设置日期后，该日期无法再被选中的问题 (#282)

qfluentwidgets/components/date_time/calendar_view.py

@@ -584,6 +584,7 @@ class CalendarView(QWidget):
     def _onDayItemClicked(self, date: QDate):
         self.close()
         if date != self.date:
+            self.date = date
             self.dateChanged.emit(date)
 
     def setDate(self, date: QDate):
@@ -616,4 +617,4 @@ class CalendarView(QWidget):
         self.slideAni.setEasingCurve(QEasingCurve.OutQuad)
         self.aniGroup.start()
 
-        self.show()
\ No newline at end of file
+        self.show()