respect default list metadata during live tests

[antonok-edm]

This is more robust than assuming the 0th element in the list is the only relevant one, and fixes the currently broken live test.

[github-actions]

Rust Benchmark

Benchmark suite	Current: ebbf483	Previous: 4738d3f	Ratio
rule-match-browserlike/brave-list	2237764084 ns/iter (± 8772899)	2252126465 ns/iter (± 13369021)	0.99
rule-match-first-request/brave-list	983996 ns/iter (± 8651)	1000284 ns/iter (± 8364)	0.98
blocker_new/brave-list	148483964 ns/iter (± 819287)	150674514 ns/iter (± 1975624)	0.99
blocker_new/brave-list-deserialize	63639518 ns/iter (± 896426)	62360204 ns/iter (± 1865060)	1.02
memory-usage/brave-list-initial	16225933 ns/iter (± 3)	16225933 ns/iter (± 3)	1
memory-usage/brave-list-initial/max	64817658 ns/iter (± 3)	64817658 ns/iter (± 3)	1
memory-usage/brave-list-initial/alloc-count	1514650 ns/iter (± 3)	1514650 ns/iter (± 3)	1
memory-usage/brave-list-1000-requests	2505592 ns/iter (± 3)	2505592 ns/iter (± 3)	1
memory-usage/brave-list-1000-requests/alloc-count	66070 ns/iter (± 3)	66070 ns/iter (± 3)	1

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