Fix a bunch of textareas that were incorrectly written as self-closing/empty tags.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@1024959 b8457f37-d9ea-0310-8a92-e5e31aec5664
Minor: Suppress IDE warning about an unused parameter. The parameter is deliberately ignored.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@1024960 b8457f37-d9ea-0310-8a92-e5e31aec5664