Fix: error from PR #216: use layout with 4 turbines per string

[dmulash]

Fix: error from PR #216: use layout with 4 turbines per string

PR Checklist

• Update layout on default library so that there are 4 turbines per string
• Update notebook examples /COWER_om_workflow.ipynb with results from new layout
• Resolve any merge conflicts

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #228   +/-   ##
==========================================
  Coverage           ?   70.28%           
==========================================
  Files              ?       22           
  Lines              ?     4311           
  Branches           ?      769           
==========================================
  Hits               ?     3030           
  Misses             ?     1043           
  Partials           ?      238           

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[RHammond2]

Looks good to me, thanks for fixing the layouts, @dmulas!