add 5 as the default option of the row number of study user attributes

[fusawa-yugo]

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Reference Issues/PRs

Fixes second one of #994

What does this implement/fix? Explain your changes.

I added 5 as an option of the row number of study user attrs.
And, I set 5 as the default option if initialRowPerPage is null (Probably).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.00%. Comparing base (44e822f) to head (6e5ddc7).
Report is 36 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1003   +/-   ##
=======================================
  Coverage   70.00%   70.00%           
=======================================
  Files          35       35           
  Lines        2387     2387           
=======================================
  Hits         1671     1671           
  Misses        716      716           

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[porink0424]

LGTM👍