format-standard class unnecessary for pages

[iandstewart]

If post formats are meant only for posts it seems unnecessary to include format-standard in the post classes for pages.

[nacin]

We should probably instead use if ( post_type_supports( $post->post_type, 'post-formats' ) ).

[westi]

Replying to nacin:

We should probably instead use if ( post_type_supports( $post->post_type, 'post-formats' ) ).

Agreed

[iandstewart]

Updated patch to exclude any post type that doesn't use post formats.

[nacin]

(In [17292]) Only add the post format post classes when the post type supports post formats. posts posts posts posts. props iandstewart, fixes #16224.