net: coap: Fix response matching algorithm #157347

Job	Run time
twister-build-prep / prep_pr	3m 42s
twister-build-prep / prep_push	0s
twister-build (1)	28m 15s
twister-build (2)	43m 54s
twister-build (3)	28m 3s
twister-build (4)	36m 22s
twister-build (5)	38m 45s
twister-build (6)	26m 37s
twister-build (7)	31m 27s
twister-build (8)	31m 38s
Publish Unit Tests Results	29s
Check Twister Status / all jobs passed	1s
	4h 29m 13s

Provide feedback