Fix validator arity check

For now, this panics, but ideally, we should return a "unknown
  purpose" error when we cannot map the name to an arity.

crates/aiken-project/src/blueprint/validator.rs

@@ -846,13 +846,11 @@ mod tests {
         let mut definitions = fixture_definitions();
         definitions.insert(
             &schema,
-            Schema::Data(Data::AnyOf(vec![
-                Constructor {
-                    index: 0,
-                    fields: vec![Declaration::Referenced(Reference::new("Bool")).into()],
-                }
-                .into(),
-            ]))
+            Schema::Data(Data::AnyOf(vec![Constructor {
+                index: 0,
+                fields: vec![Declaration::Referenced(Reference::new("Bool")).into()],
+            }
+            .into()]))
             .into(),
         );