Add the "aside,audio,canvas,figcaption,figure,nav,output,video" tags that...

Add the "aside,audio,canvas,figcaption,figure,nav,output,video" tags that shouldn't be wrapped in <p> to the internal blocks list in TinyMCE, fixes #20381

git-svn-id: https://core.svn.wordpress.org/trunk@20389 1a063a9b-81f0-0310-95a4-ce76da25c4cd