Media: Use the default 40px button height in the media modal

[t-hamano]

Alternatives to #12112

If the button size is 32px by default, many CSS overrides are required to match the height of other form elements such as input and select, which are 40px.

This PR changes the default button size from 32px to 40px in the media modal and attachment detail modal. While this PR is a bit aggressive, it should resolve all button size inconsistencies.

Trac ticket: https://core.trac.wordpress.org/ticket/65428

Screenshots

Attachment details modal

Before	After

Image details

Before	After

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