Shifting Freshman Table

# Issue
When switching between dropdown options (as shown below), the table containing the freshmen packets shifts rightward out of the frame. (Frame being the area provided for tables)

This is unexpected behavior as the table should only update its order without shifting rightward.

# Potential Trails to Follow

I believe this stems from the tables.js file, specifically the controller for how the table is updated when a dropdown item is selected. I've attached a link to the blob below.

https://github.com/ComputerScienceHouse/packet/blob/develop/packet/static/js/tables.js

首先重现切换下拉选项时发生的偏移，然后阅读 packet/static/js/tables.js，尤其是选择后更新表格的控制器。跟踪 freshmen packet 表格是如何重新排序的，并验证 frame 位置得以保留。完成的标准是：更改下拉选项只更新表格顺序，不会将其向右移动到 frame 外部。

由索引模型根据 Issue 内容生成。