auth: Set correct flags in token_extractRxkad

auth: Set correct flags in token_extractRxkad

The flags that token_extractRxkad returns are flags that are passed to
ktc_SetToken, not the flags that are passed directly to the PSetTokens
pioctl. So, we should be setting AFS_SETTOK_SETPAG, which is
interpreted by ktc_SetToken.

Change-Id: Id63ba4d5874e43c8d1f02817bf33975516a974be
Reviewed-on: http://gerrit.openafs.org/4480
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>