Fixed the graphic for Episode 56

[Jenkins]

It appears there was a problem with the graphic for Episode 56 that prevented it from appearing on some browser and setting combinations that are not part of our regular tests. Alas. This has now been fixed. Or so we believe. If any of you Noble Readers are still getting the graphic for Episode 55 instead of the current one, please let us know so that we can determine what went wrong, fix it, and find scapegoat here in the Signal Corps to blame it on