Don't show edit/remove image buttons in the visual editor when an image is...

Don't show edit/remove image buttons in the visual editor when an image is floated, doesn't have a caption and there is text in the same paragraph, props solarissmoke, fixes #19611

git-svn-id: https://core.svn.wordpress.org/trunk@19984 1a063a9b-81f0-0310-95a4-ce76da25c4cd