Clean up for 05/18/2023 content update

[Gregory Hecht]

This week's update added a new magazine title Best of the Mighty Marvel Backlist.  There is a comic book title with that same name (slightly different capitalization), and I suspect the comic title should be deleted as it is almost certainly duplicative.  

Also, under the list of New Magazines that were added, an item called best of the mighty marvel backlist #1 was added.  Note the complete lack of capital letters.  I'm not sure what is going on under the hood there, but thought I would point it out.