create wallpaper dir if doesnt exist

[danlipert]

Description

This PR creates a directory to store the profile wallpaper if it doesn't exist - this will happen on a newly deployed server so now one less thing to keep track of when putting up a new box

Refers/Fixes

#5921

Testing

untested but non-destructive

[owocki]

one thing i didnt realize from the other thread.. the wallpaper dir needs to copy the wallpapers over from /assets/wallpapers too (or collectstatic should run).. otherwise the API call will not return anything

[codecov]

Codecov Report

Merging #5932 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5932   +/-   ##
=======================================
  Coverage   17.51%   17.51%           
=======================================
  Files         259      259           
  Lines       23172    23172           
  Branches     3372     3372           
=======================================
  Hits         4059     4059           
+ Misses      19103    19099    -4     
- Partials       10       14    +4

Impacted Files	Coverage Δ
...eting/management/commands/assemble_leaderboards.py	20.96% <0%> (ø)	⬆️
app/dashboard/views.py	9.34% <0%> (ø)	⬆️
...rketing/management/commands/no_applicants_email.py	0% <0%> (ø)	⬆️

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[danlipert]

@owocki thanks for the heads up - i moved the directory creation call to before collectstatic getting ran

[owocki]

note that collectstatic doesnt run on all servers tho :P typically just one server..