message: Fixed error in Objective-C wrapper
diff: @@ -620,7 +620,7 @@ void VcxWrapperCommonNumberStringCallback(vcx_command_handle_t xcommand_handle,
  vcx_error_t ret;
  vcx_command_handle_t handle = [[VcxCallbacks sharedInstance] createCommandHandleFor:completion];
  const char * cMessage = [message cStringUsingEncoding:NSUTF8StringEncoding];
  - ret = vcx_connection_update_state_with_message(handle, cMessage, connectionHandle, VcxWrapperCommonNumberCallback);
  + ret = vcx_connection_update_state_with_message(handle, connectionHandle, cMessage, VcxWrapperCommonNumberCallback);
  if( ret != 0 )
  {
  @@ -1266,7 +1266,7 @@ withConnectionHandle:(vcx_connection_handle_t)connection_handle
  vcx_error_t ret;
  vcx_command_handle_t handle = [[VcxCallbacks sharedInstance] createCommandHandleFor:completion];
  const char * cMessage = [message cStringUsingEncoding:NSUTF8StringEncoding];
  - ret = vcx_disclosed_proof_update_state_with_message(handle, credentialHandle, cMessage, VcxWrapperCommonNumberCallback);
  + ret = vcx_disclosed_proof_update_state_with_message(handle, proofHandle, cMessage, VcxWrapperCommonNumberCallback);
  if( ret != 0 )
  {
  