yihan fix the issue that logged time missing on leaderboard

[AriaYu927]

Description

Main changes explained:

• Update file timeEntryController.js for improving code logic.
• Update file dashboardhelper.js for correcting the syntax of mongodb query (root cause of the problem).

How to test:

1. check into current branch
2. do npm run build and npm start to run this PR locally
3. Clear site data/cache
4. log as any user
5. go to dashboard→ leaderboard
6. verify if the Tangible Time and Total Time of each user is correct, which should match the sum of logged time in dashboard -> Tasks and Timelogs -> Current Week Timelog.

Screenshots or videos of changes:

Before:

Screen.Recording.2023-12-20.at.20.54.12.mov

After:

Screen.Recording.2023-12-20.at.20.54.58.mov