chimera: Fix creation time flag in ls command

The ls command of the chimera CLI fails to interpret the creation time
flag correctly.

Target: trunk
Request: 2.10
Request: 2.9
Require-notes: yes
Require-book: no
Acked-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Patch: https://rb.dcache.org/r/7268/