Fix the order of the solves of the user pages to the chronological ordering (latest first).

[Cryptanalyse]

Problem: When one looks at a user page, the list of the solves is in a seemingly random order.

Solution suggested: This small PR fixes that ordering by sorting the solves in reverse chronological order (latest solve first).

[ColdHeat]

I feel like it was written to be ordered in date descending but it is possible that that functionality was lost somewhere.

[codecov[bot]]

Codecov Report

Merging #2108 (a59bd84) into master (d89ac57) will not change coverage. The diff coverage is 100.00%.

:exclamation: Current head a59bd84 differs from pull request most recent head f9563bc. Consider uploading reports for the commit f9563bc to get more accurate results

@@           Coverage Diff           @@
##           master    #2108   +/-   ##
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  Coverage   87.73%   87.73%           
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  Files         131      131           
  Lines        7433     7433           
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  Hits         6521     6521           
  Misses        912      912           

Impacted Files	Coverage Δ
CTFd/models/__init__.py	96.71% <100.00%> (ø)

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[Cryptanalyse]

Possible yes. I have a fork of CTFd, and without the ordering fixed (asc or desc, as you prefer), the order appears somewhat random. I feel like even if it's already sorted in this original repo, there is no harm in re-sorting just in case some plugins modify it.