Optimize the algorithm of Weekly Bonus.优化周加成算法

Now the Fast Invasions image should not be displayed as the Double Star Bar image.

Fix a bug where the remaining time of Week Bonus was displayed as the remaining time of Event during Event.
The remaining time of Week Bonus is now displayed correctly during Event.

修复一个错误，在活动期间，周加成的剩余时间显示成了活动的剩余时间。
现在在活动期间，可以正确的显示周加成的剩余时间了。

Fix the countdown and time calculation error when there is no image and date of any week Bonus or event exists, if this case is satisfied, it will show one more what the current week Bonus is in the countdown text.

修复在没有存在任何周Bonus或者事件的图片和日期时，倒计时和时间计算错误问题，如果满足这个情况，会多显示一个当周Bonus是什么的在倒计时文本中。

欢迎UI添加了所有每周加成的时间列表，和当前活动或周加成的倒计时。WelcomeUI added the time list of all Weekly Bonus, added the countdown of Weekly Bonus or events.