scheduler/colorman.c: Fix memory leak during creating color profile

scheduler/colorman.c: Fix memory leak during creating color profile

Since the array `profiles` is set to use `strdup()` as a copy function, we
don't have to use `strdup()` on the element which is passed as parameter
of `cupsArrayAdd()` - using the `strdup()` as we used till now causes
memory leak.

Reproducer is the same as https://github.com/OpenPrinting/cups/pull/813
.