WRR-789: Clean up default props in sandstone sampler

[dongsuwon]

Enact-DCO-1.0-Signed-off-by: Dongsu Won (dongsu.won@lgepartner.com)

Checklist

• I have read and understand the contribution guide
• A CHANGELOG entry is included
• At least one test case is included for this feature or bug fix
• Documentation was added or is not needed
• This is an API breaking change

Issue Resolved / Feature Added

Some default props in sampler is being misused or omitted 'Default'.
So we need to default props in sampler.

Resolution

Fix default props in sampler as per the docs.

Additional Considerations

Links

WRR-789

Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.55%. Comparing base (a4d543d) to head (adeddaa).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1731   +/-   ##
========================================
  Coverage    81.55%   81.55%           
========================================
  Files          148      148           
  Lines         6673     6673           
  Branches      1985     1985           
========================================
  Hits          5442     5442           
  Misses         938      938           
  Partials       293      293           

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