TinyMCE, image toolbar: remove the animation and make the box-shadow lighter.

Merges [30812] to the 4.1 branch.

props melchoyce.
fixes #30664.

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Fix the search field width in the media modal, media library grid and on the install new plugins screen.

Merges [30813] to the 4.1 branch.

props helen.
fixes #30658.

Built from https://develop.svn.wordpress.org/branches/4.1@30816


git-svn-id: http://core.svn.wordpress.org/branches/4.1@30806 1a063a9b-81f0-0310-95a4-ce76da25c4cd