Add Ayato demo

Author: Tibowl

src/data/gamedata/characters.json

@@ -10959,7 +10959,8 @@
         "https://upload-os-bbs.hoyolab.com/upload/2022/02/04/1015537/d5a3efddb1735de9921626396a47cebc_6306395664639823316.jpg"
       ],
       "videos": {
-        "Character Teaser - \"Kamisato Ayato: Lanterns in the Night\"": "https://youtu.be/s3ok84NeMdU"
+        "Character Teaser - \"Kamisato Ayato: Lanterns in the Night\"": "https://youtu.be/s3ok84NeMdU",
+        "Character Demo - \"Kamisato Ayato: Fathomless Swirls in the Forest\"": "https://youtu.be/KxMs7IsSTgs"
       }
     },
     "meta": {