Fix issue # 1242261: Htmlz does not apply inline css from <body>.
HTMLZ Output: Fix inlining of CSS ignoring styles on the <body> element

Fixes #1242261 [Htmlz does not apply inline css from <body>](https://bugs.launchpad.net/calibre/+bug/1242261)

Merge branch 'master' of https://github.com/user-none/calibre