Make "Contest Ends..." link to timeanddate.com of contest end time instead of start time

[tandr3w]

Fixes #2027

the link now goes to the contest end time if it has already started might be a bad solution, this is my first pr ever idk

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (81f3c90) 47.05% compared to head (6f3a04f) 47.05%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2258 +/- ## ======================================= Coverage 47.05% 47.05% ======================================= Files 249 249 Lines 13209 13209 ======================================= Hits 6215 6215 Misses 6994 6994 ```

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[Xyene]

Thanks!