Fix incorrect username in admin interface

[stefanoborini]

Fixes #348

[codecov-io]

Codecov Report

Merging #353 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master    #353   +/-   ##
======================================
  Coverage    94.9%   94.9%           
======================================
  Files          88      88           
  Lines        3789    3789           
  Branches      247     247           
======================================
  Hits         3596    3596           
  Misses        133     133           
  Partials       60      60

Impacted Files	Coverage Δ
...oteappmanager/handlers/admin/accounting_handler.py	100% <100%> (ø)	✅

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