Align DataTables header hover styling with Jenkins core#665

Haschwalt29 wants to merge 2 commits into

jenkinsci:mainjenkinsci/data-tables-api-plugin:mainfrom

Haschwalt29:JENKINS-76309-datatables-hoverHaschwalt29/data-tables-api-plugin:JENKINS-76309-datatables-hoverCopy head branch name to clipboard