Fixes missing avatars in offline mode

[sdwolfz]

Fixes #3464.

I got the idea for this fix from here.
Aparently in offline mode the avatar filename is already set before it is generated and this line overwrote it every time.

[codecov-io]

Codecov Report

Merging #3471 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3471      +/-   ##
==========================================
- Coverage   35.69%   35.68%   -0.01%     
==========================================
  Files         281      281              
  Lines       40706    40708       +2     
==========================================
- Hits        14528    14527       -1     
- Misses      24028    24030       +2     
- Partials     2150     2151       +1

Impacted Files	Coverage Δ
models/user.go	39.56% <100%> (+0.13%)	⬆️
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️

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[lafriks]

@sdwolfz please backport commit 011f128 to branch release/v1.4