user_mgmt: Fix error message with file name
user_mgmt: Fix error message with file name

Updated error message with proper config file name

Tested:
Verified that file name is properly listed in error message

Change-Id: I0c2552000f704f3b4b541b8fe90adec966a6616a
Signed-off-by: Richard Marian Thomaiyar <72ed7ca0c1d67ded0b254900bd2112efa735a144@linux.intel.com>

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid