What does this change do?
This change adds the deselect all and reset to defaults buttons to the
edit navigation menu categories modal. The deselect all button when
click deselects all the selected categories in the modal. If the user
saves with no categories selected, the user's categories section in the
navigation menu will be set to the site's top categories.
The reset to defaults button is only shown when the
`default_navigation_menu_categories` site setting has been configured.
When clicked, the user's categories section in the navigation menu is
automatically set to the categories defined by the
`default_navigation_menu_categories` site setting.
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