Proposal : Update Anime Ninja Slayer From Animation type

Proposal details

This proposal will make the following change(s):

Update the type of the anime Ninja Slayer From Animation

Change the type from Unknown to ONA

Based on the following reason: Missing

With the source: https://myanimelist.net/anime/23605/Ninja_Slayer_From_Animation?q=Ninja%20Slayer%20From%20Animation&cat=anime