libct/cg/v2: always enable TasksAccounting

This unconditionally enables TasksAccounting for systemd unified (v2)
cgroup driver, making it work the same way as the legacy (v1) driver.

Practically, it is probably a no-op since DefaultTasksAccounting is
usually true.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/cgroups/systemd/v1.go

@@ -158,7 +158,8 @@ func (m *legacyManager) Apply(pid int) error {
 		newProp("MemoryAccounting", true),
 		newProp("CPUAccounting", true),
 		newProp("BlockIOAccounting", true),
-		newProp("TasksAccounting", true))
+		newProp("TasksAccounting", true),
+	)
 
 	// Assume DefaultDependencies= will always work (the check for it was previously broken.)
 	properties = append(properties,

libcontainer/cgroups/systemd/v2.go

@@ -141,7 +141,6 @@ func unifiedResToSystemdProps(conn *systemdDbus.Conn, res map[string]string) (pr
 				}
 			}
 			props = append(props,
-				newProp("TasksAccounting", true),
 				newProp("TasksMax", num))
 
 		case "memory.oom.group":
@@ -272,7 +271,9 @@ func (m *unifiedManager) Apply(pid int) error {
 	properties = append(properties,
 		newProp("MemoryAccounting", true),
 		newProp("CPUAccounting", true),
-		newProp("IOAccounting", true))
+		newProp("IOAccounting", true),
+		newProp("TasksAccounting", true),
+	)
 
 	// Assume DefaultDependencies= will always work (the check for it was previously broken.)
 	properties = append(properties,