wifi: iwlwifi: tests: simplify devinfo_no_trans_cfg_dups()

There's no need to build a list of individual configs
first and then compare them, we can just go through all
of them and compare if the pointers aren't the same.
The complexity (in terms of number of comparisons) is a
bit higher that way, but it's just a test and the code
complexity is much lower without that.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250504132447.85911c59d96a.I540f464229da3566d1726dfb61b46002fbb73bde@changeid