Remove validate.schema as a trap door

lib/wallet.js

@@ -19,9 +19,6 @@ export function generateSchema (wallet) {
       return validator
     }
 
-    // complex validation
-    if (field.validate.schema) return field.validate.schema
-
     const { type: validationType, words, min, max } = field.validate
 
     let validator

wallets/nwc/index.js

@@ -10,9 +10,8 @@ export const fields = [
     label: 'connection',
     type: 'password',
     validate: {
-      schema: string()
-        .required('required')
-        .test(async (nwcUrl, context) => {
+      type: 'string',
+      test: async (nwcUrl, context) => {
         // run validation in sequence to control order of errors
         // inspired by https://github.com/jquense/yup/issues/851#issuecomment-1049705180
         try {
@@ -32,7 +31,7 @@ export const fields = [
           return context.createError({ message: err.message })
         }
         return true
-        })
+      }
     }
   }
 ]