Bundled Themes: Make sure new gallery widgets look good in themes

Twenty Ten: Reduces image size and removes image borders for galleries in widget areas.
Twenty Eleven: Reduces image size and removes image borders for galleries in widget areas.
Twenty Twelve: Reduces image size for some gallery sizes in widget areas.
Twenty Thirteen: Ensure proper clearing for images, hide captions for some gallery column combos and ensure good display for galleries in widget areas.
Twenty Fourteen: Ensure proper clearing for images and hide captions for some gallery column combos for galleries in widget areas.
Twenty Seventeen: Hide captions for some gallery column combos for galleries in widget areas.

Props joyously, williampatton, davidakennedy, melchoyce, crunnells.

Fixes #41969.

Built from https://develop.svn.wordpress.org/trunk@42019


git-svn-id: https://core.svn.wordpress.org/trunk@41853 1a063a9b-81f0-0310-95a4-ce76da25c4cd