Fix showing the observer group name

[bjoernricks]

Checklist:

• [n/a] Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1393 into gsa-8.0 will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff            @@
##           gsa-8.0    #1393   +/-   ##
========================================
  Coverage    36.39%   36.39%           
========================================
  Files          960      960           
  Lines        21657    21657           
  Branches      5996     5996           
========================================
  Hits          7881     7881           
  Misses       12444    12444           
  Partials      1332     1332

Impacted Files	Coverage Δ
gsa/src/web/pages/tasks/row.js	11.76% <0%> (ø)	⬆️

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