Opening Waiver from table doesn't fill up date

[tupaschoal]

Describe the issue
When you click on a day to open the waiver window, the dates are not being filled up

To Reproduce

1. Open TTL
2. Click on any day to open the workday waiver manager
3. Note how date is unfilled

Expected behavior
Date should be pre-filled with the clicked day

Environment

• Version: 1.5.2-dev
• Electron: 9.0.0
• Chrome: 83.0.4103.64
• Node.js: 12.14.1
• OS: Windows_NT x64 10.0.18362

Screenshots

Additional context
Opening it from the menu fills it with the current day

[NetizenAbel]

Let's check the difference between the call in calendar.js vs the call in main.js's menu. Ideally that entire part should be put into its own js, and reference by the same methods.