net: hns3: fix inconsistent vf id print

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

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The vf id from ethtool is added 1 before configured to driver.
So it's necessary to minus 1 when printing it, in order to
keep consistent with user's configuration.

Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Reviewed-by: li yongxin <liyongxin1@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>