bugfix(#534): on display number change reset to the first page

[lmoesle]

Description

Short description or comments

Reference

Issues: closes #534

Check-List

• All Acceptance criteria of user story are met
• JUnit tests are written (60% CodeCov)
• Internal Review is maintained
• Documentations external and internal are completed
• Smoketest successful (Manual E2E-Test depending on Change)
• No Branch waste left
• Board is up-to-date
• Openshift environments are prepared (Secrets, etc.) and release-issue is maintained

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (919c3b4) 37.64% compared to head (940f670) 37.64%.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #1081   +/-   ##
=========================================
  Coverage     37.64%   37.64%           
  Complexity     1258     1258           
=========================================
  Files           601      601           
  Lines          8703     8703           
  Branches        422      422           
=========================================
  Hits           3276     3276           
  Misses         5294     5294           
  Partials        133      133           

Flag	Coverage Δ
unittests	37.64% <ø> (ø)

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