ecryptfs-utils: fixed pam-config usage during update

ecryptfs-utils was updated so that package updating
does not remove the PAM snippets.

- fix %postun to not run pam-config on update (bnc#814098, bnc#834993)

Fixed bugs
bnc#814098
The script "/usr/bin/ecryptfs-setup-swap" is broken (from ecryptfs-utils)
bnc#834993
After upgrade the ecryptfs-utils package to 103 version. Im not able to log into XFC using a LightDM.
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