Fix for Juniper Google 2FA

[Yage Hu]

The Google 2FA support for Juniper was not working due to a minor typo
in `auth-juniper.c`.

When attempting to connect with --juniper --token-mode=totp
--token-secret=<XXX> the error:

    Unknown form ID 'frmTotpToken'

would pop up along with some HTML dump.

I simply corrected the typo (ftmTotpToken -> frmTotpToken). `git am` to
apply patch.

Signed-off-by: Yage Hu <yageh at supermicro.com>
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