fix: incorrect account type (#237)

Should be "ed25519", as the default keyring type was used.

packages/adapter/src/extension/index.ts

@@ -25,7 +25,7 @@ function transformAccounts(accounts: string[]): InjectedAccount[] {
   return accounts.map((address, i) => ({
     address,
     name: `Polkadot Snap #${i}`,
-    type: 'ethereum'
+    type: 'ed25519'
   }));
 }