message: fix WalletHandle and PoolHandle in tests
diff: @@ -439,7 +439,7 @@ mod tests {
  use api::VcxStateType;
  use api::return_types_u32;
  use api::connection::vcx_connection_create;
  - use indy_sys::{WalletHandle};
  + use indy_sys::{WalletHandle, INVALID_POOL_HANDLE};
  fn create_config_util(logging: Option<&str>) -> String {
  json!({"agency_did" : "72x8p4HubxzUK1dwxcc5FU",
  @@ -552,7 +552,7 @@ mod tests {
  thread::sleep(Duration::from_secs(1));
  assert!(rc.is_err());
  assert_eq!(get_pool_handle().unwrap_err().kind(), VcxErrorKind::NoPoolOpen);
  - assert_eq!(wallet::get_wallet_handle(), 0);
  + assert_eq!(wallet::get_wallet_handle(), INVALID_WALLET_HANDLE);
  wallet::delete_wallet(wallet_name, None, None, None).unwrap();
  }
  @@ -1037,8 +1037,8 @@ mod tests {
  assert_ne!(wallet_handle, INVALID_WALLET_HANDLE);
  assert_ne!(pool_handle, INVALID_POOL_HANDLE);
  // Reset handles to 0
  - assert_eq!(::api::utils::vcx_pool_set_handle(INVALID_POOL_HANDLE), 0);
  - assert_eq!(::api::wallet::vcx_wallet_set_handle(INVALID_WALLET_HANDLE), 0);
  + assert_eq!(::api::utils::vcx_pool_set_handle(INVALID_POOL_HANDLE), INVALID_POOL_HANDLE);
  + assert_eq!(::api::wallet::vcx_wallet_set_handle(INVALID_WALLET_HANDLE), INVALID_WALLET_HANDLE);
  // Test for errors when handles not set
  assert_ne!(error::SUCCESS.code_num, vcx_init_minimal(config));
  ::api::wallet::vcx_wallet_set_handle(wallet_handle);
  