DCAP mover shows incorrect `last modified` for active transfer

[kofemann]

trafficstars

As shown below, running mover ls twice displays the increasing number of transferred bytes, but the mover last modify time is not updated, so it might be falsely interpreted as a stale mover.

[dcache-head] (local) > \s dcache-324 mover ls 33554435
33554435;DCap-Kerberos-dcache-door:7;01/31-08:42:34;01/31-08:42:34;RUNNING;0000F3A37C1EE00C45A09F9FCE1468B7F67D;B=19844364844;T=368788;L=368;

[dcache-head] (local) > \s dcache-324 mover ls 33554435
33554435;DCap-Kerberos-dcache-door:7;01/31-08:42:34;01/31-08:42:34;RUNNING;0000F3A37C1EE00C45A09F9FCE1468B7F67D;B=19947995680;T=374956;L=374;