Fix initWithImage on UI7BarButtonItem

I have make some small fix in UI7BarButtonItem

Now Code like below works:

    UIImage *leftBarButtonIcon = [UIImage imageNamed:@"myImage"];
    
    UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithImage:leftBarButtonIcon
                                                                      style:UIBarButtonItemStylePlain
                                                                     target:self
                                                                     action:@selector(touchLogoutBackButton:)];
    
    self.navigationItem.leftBarButtonItem = barButtonItem;