message: Remove WalletIOError from API
diff: @@ -116,20 +116,17 @@ pub enum ErrorCode
  // Returned if provided wallet query is invalid
  WalletQueryError = 214,
  - // Returned if I/O error occurred during wallet operation
  - WalletIOError = 215,
  -
  // Returned if wallet input has invalid structure (currently used in wallet import)
  - WalletStructureError = 216,
  + WalletStructureError = 215,
  // Returned if the wallet is not empty, but it is required (currently only when importing)
  - WalletNotEmpty = 217,
  + WalletNotEmpty = 216,
  // Returned if path provided to wallet export already exists
  - WalletExportPathExists = 218,
  + WalletExportPathExists = 217,
  // Returned if path provided to wallet import does not exist
  - WalletImportPathDoesNotExist = 219,
  + WalletImportPathDoesNotExist = 218,
  // Ledger errors
  // Trying to open pool ledger that wasn't created before
  