www/rtv: Update to 1.16.0

Features

Added the ability to copy links to the OS clipboard with y and Y.
Both submissions and comments can now be viewed on /user/ pages.
A MIME parser has been added for www.streamable.com.
A MIME parser has been added for www.vidme.com.
Submission URLs can now be opened while viewing the comments page.

Bugfixes

More graceful handling for the invalid LOCALE error on MacOS.
A fatal error is now raised when trying to run on Windows without curses.
Fixed an error when trying to view saved comments.
Invalid refresh-tokens are now automatically deleted.
Users who are signed up for Reddit's beta profiles can now launch RTV.

Approved by: garga (mentor)
Differential Revision: https://reviews.freebsd.org/D11419