Media Grid: Swap arrow direction in RTL in Attachment Details modal.

props adamsilverstein.
fixes #28980.
Built from https://develop.svn.wordpress.org/trunk@29264


git-svn-id: http://core.svn.wordpress.org/trunk@29047 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Media Grid: Fix missing padding in RTL in Attachment Details modal.

see #28980.
Built from https://develop.svn.wordpress.org/trunk@29265


git-svn-id: http://core.svn.wordpress.org/trunk@29048 1a063a9b-81f0-0310-95a4-ce76da25c4cd