migration: disable compress

it's already disable by default,
but we want to be sure if it's change in later release

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>

PVE/QemuServer.pm

@@ -3857,6 +3857,7 @@ sub set_migration_caps {
 	"xbzrle" => 1,
 	"x-rdma-pin-all" => 0,
 	"zero-blocks" => 0,
+	"compress" => 0
     };
 
     my $supported_capabilities = vm_mon_cmd_nocheck($vmid, "query-migrate-capabilities");