Media Grid: Remove fields from showing in the grid itself.

All details are still available within the modal, and less-distinguishable non-image files still show the filename along with the file type icon.

Reverts [29079], [29078], [29077], and [28995]. see #24716.

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git-svn-id: http://core.svn.wordpress.org/trunk@29062 1a063a9b-81f0-0310-95a4-ce76da25c4cd