core: /_wallet delete takes no confirmation word

The wallet is an API, and no other API command takes a typed confirmation:
/_delete user takes the profile password. The word was also no barrier to a
caller, which can read it from /_wallet export. Confirming belongs in the
command that will wrap this one.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Rvc3HbiWBTqbAvRT45G5oX

src/Simplex/Chat/Controller.hs

@@ -421,7 +421,7 @@ data ChatCommand
   | APIWalletCreate
   | APIWalletImport {recoveryPhrase :: Text}
   | APIWalletExport
-  | APIWalletDelete {confirmWord :: Text}
+  | APIWalletDelete
   | APISendCallInvitation ContactId CallType
   | SendCallInvitation ContactName CallType
   | APIRejectCall ContactId
@@ -751,7 +751,7 @@ allowRemoteCommand = \case
   APIWalletCreate -> False
   APIWalletImport _ -> False
   APIWalletExport -> False
-  APIWalletDelete _ -> False
+  APIWalletDelete -> False
   _ -> True
 
 data RelayConnectionResult = RelayConnectionResult