vmfex: fix vdsm.spec.in error

I was fixing http://gerrit.ovirt.org/#/c/22529/10 on a host and
verifying there. I decided that for one word ammend I could copy
it by hand and I managed to "fat-finger" it. May the typo machines
that are my hands get urticaria.

Change-Id: I945aa704648acf17dcd49e07e3e853a22e9f146e
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/22577
Reviewed-by: Dan Kenigsberg <danken@redhat.com>