add tests for results listpage

[sarahd93]

What:
Add tests for results listpage.

Why:
The page doesn't have tests yet and we need them before we can start refactoring.

How:

Checklist:

• Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #2735 (60101c2) into master (fc566a2) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2735      +/-   ##
==========================================
+ Coverage   62.80%   62.90%   +0.09%     
==========================================
  Files        1116     1116              
  Lines       28371    28371              
  Branches     8034     8034              
==========================================
+ Hits        17819    17846      +27     
+ Misses       9563     9537      -26     
+ Partials      989      988       -1     

Impacted Files	Coverage Δ
gsa/src/web/pages/results/row.js	82.75% <0.00%> (+10.34%)	⬆️
gsa/src/web/pages/results/table.js	94.73% <0.00%> (+10.52%)	⬆️
gsa/src/web/pages/results/dashboard/cvssdisplay.js	83.33% <0.00%> (+16.66%)	⬆️
...eb/pages/results/dashboard/severityclassdisplay.js	83.33% <0.00%> (+16.66%)	⬆️
gsa/src/web/pages/results/dashboard/loaders.js	88.88% <0.00%> (+22.22%)	⬆️
gsa/src/web/pages/results/dashboard/index.js	100.00% <0.00%> (+25.00%)	⬆️
...rc/web/pages/results/dashboard/wordclouddisplay.js	48.64% <0.00%> (+29.72%)	⬆️
gsa/src/web/pages/results/listpage.js	100.00% <0.00%> (+50.00%)	⬆️

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