remove running from Storage and check it in QemuServer

It is better to check if a VM is running in QemuServer then in Storage.
for the Storage there is no difference if it is running or not.

Signed-off-by: Wolfgang Link <w.link@proxmox.com>

PVE/Storage/ZFSPoolPlugin.pm

@@ -446,7 +446,7 @@ sub volume_size_info {
 }
 
 sub volume_snapshot {
-    my ($class, $scfg, $storeid, $volname, $snap, $running) = @_;
+    my ($class, $scfg, $storeid, $volname, $snap) = @_;
 
     $class->zfs_request($scfg, undef, 'snapshot', "$scfg->{pool}/$volname\@$snap");
 }