Hide the "Need Help..." text from the Page Attributes meta-box if the help tab is hidden

[bananastalktome]

Even if the "Help" tab has been hidden (using $current_screen->remove_help_tabs()), the "Need help? Use the Help tab in the upper right of your screen." message still appears on the Page Attributes meta-box when editing a page.

The included patch will check if get_current_screen()->get_help_tabs() != false (in addition to whether it is a 'page' post type) in order to show the message.

[SergeyBiryukov]

In 31303:

Don't display the Help tab reference in Page Attributes meta box if Help tab was removed.

props bananastalktome.
fixes #31164.