Changing how to use textdifference thing

I think it'd be better to use text difference if a substring isn't found.

I realised afterwards that I think this is how Scryfall does it anyway.

scryfall_deser/Cargo.toml

@@ -14,5 +14,6 @@ rusqlite = "0.37.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.138"
 tempfile = "3.20.0"
+textdistance = "1.1.1"
 ureq = { version = "3.0.12", features = ["json"] }
 uuid = { version = "1.12.1", features = ["v4", "serde"] }