Apply 'taxonomy_parent_dropdown_args' filter when editing terms.

Added in WP 3.7 [25123], the 'taxonomy_parent_dropdown_args' filter affected
only the term creation interface. This changeset introduces parity by ensuring
that it is applied when editing terms as well.

The new `$context` parameter indicates whether the filter is being applied in
a 'new' or 'edit' context.

Props TimothyBlynJacobs, DrewAPicture.
Fixes #29853.
Built from https://develop.svn.wordpress.org/trunk@30998


git-svn-id: http://core.svn.wordpress.org/trunk@30980 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix incorrect `@since` tag introduced in [30998].

Props dimadin.
See #25853.
Built from https://develop.svn.wordpress.org/trunk@30999


git-svn-id: http://core.svn.wordpress.org/trunk@30981 1a063a9b-81f0-0310-95a4-ce76da25c4cd