5982-Fix arch mur and current mur sort

[fec-jli]

Summary (required)

This PR will fix incorrect order for current MURs and Arch MURs.

• Resolves Incorrect MUR sort order #5982

Required reviewers

1-2 devs

Impacted areas of the application

'/legal/search/'

General components of the application that this PR will affect:
current_cases.py
archived_murs.py
legal.py

How to test

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.69%. Comparing base (e690791) to head (34f0f7f).

Files with missing lines	Patch %	Lines
webservices/resources/legal.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6008      +/-   ##
===========================================
+ Coverage    86.66%   86.69%   +0.02%     
===========================================
  Files           82       82              
  Lines         8989     8994       +5     
===========================================
+ Hits          7790     7797       +7     
+ Misses        1199     1197       -2     

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