[frontend] UI fix scrollbar useless in custom dashboard (#8282)

[CelineSebe]

Proposed changes

• paddingBottom removed

Related issues

• Useless vertical scrollbar in custom dashboard + hidden by the header #8282

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.30%. Comparing base (88697d0) to head (5bf165d).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8823   +/-   ##
=======================================
  Coverage   66.30%   66.30%           
=======================================
  Files         597      597           
  Lines       60976    60976           
  Branches     6267     6267           
=======================================
  Hits        40430    40430           
  Misses      20546    20546           

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