Do not require dogtag-pki-server-theme

Theme package is contains resources for PKI web interface. This interface
is not needed by FreeIPA as it rather utilizes it's API. As recommended in
https://bugzilla.redhat.com/show_bug.cgi?id=1068029#c5, remove this hard
dependency.

Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

freeipa.spec.in

@@ -112,7 +112,6 @@ Requires: selinux-policy >= 3.12.1-176
 Requires(post): selinux-policy-base
 Requires: slapi-nis >= 0.47.7
 Requires: pki-ca >= 10.1.1
-Requires: dogtag-pki-server-theme
 %if 0%{?rhel}
 Requires: subscription-manager
 %endif