qemu: Drop comma after QEMU_CAPS_LAST in queryDirtyRateRequired[]
qemu: Drop comma after QEMU_CAPS_LAST in queryDirtyRateRequired[]

The idea of queryDirtyRateRequired[] is that it lists QEMU
capabilities required for given domstats record
(VIR_DOMAIN_STATS_DIRTYRATE in this particular case) and
QEMU_CAPS_LAST is used as a sentinel. Therefore, there can never
be anything after it. Drop the comma to make it more obvious.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

libvirt/libvirt,jfehlig/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,crobinso/libvirt,crobinso/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,libvirt/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,crobinso/libvirt