Re-enable random avatar feature

[daviian]

PR fixes not usable random avatars because a check introduced to enable custom avatars made the code responsible for random avatars unreachable.

This behaviour was and is still noticeable in gogs as well.

Furthermore with this change the radio buttons in the avatar form are useable again.
But IMHO the avatar form should be refurbished to better communicate the available features and how to achieve them.

[codecov-io]

Codecov Report

Merging #3988 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3988      +/-   ##
==========================================
- Coverage   20.08%   20.07%   -0.02%     
==========================================
  Files         151      151              
  Lines       29874    29874              
==========================================
- Hits         6000     5997       -3     
- Misses      22968    22970       +2     
- Partials      906      907       +1

Impacted Files	Coverage Δ
routers/user/setting/profile.go	0% <0%> (ø)	⬆️
modules/process/manager.go	69.56% <0%> (-4.35%)	⬇️

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[lunny]

make L-G-T-M work