only use a profiles most recent location to mark a location, for leaderboards

[owocki]

Description

only use a profiles most recent location to mark a location, for leaderboards

Refers/Fixes

https://gitcoin.co/leaderboard/countries?cadence=quarterly&keyword=all&product=all
why does the country list show prague still active in 2020? could it have anything to do with the fact that the entire ehtereum community was in prague in 2019? lol

Testing

tested locally

[PixelantDesign]

makes sense to me!

[thelostone-mc]

@owocki looks like CI is failing !

[owocki]

just submited a fix

[codecov]

Codecov Report

Merging #6772 into master will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master    #6772   +/-   ##
=======================================
  Coverage   26.93%   26.93%           
=======================================
  Files         297      297           
  Lines       28373    28374    +1     
  Branches     4153     4154    +1     
=======================================
+ Hits         7641     7643    +2     
+ Misses      20458    20452    -6     
- Partials      274      279    +5     

Impacted Files	Coverage Δ
...eting/management/commands/assemble_leaderboards.py	39.73% <50.00%> (-0.11%)	⬇️
app/dashboard/models.py	49.56% <100.00%> (+0.07%)	⬆️
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.61% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)

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