perf(l1, l2): remove unneeded compute_hash call on trie get_node

[jrchatruc]

Motivation

Description

Closes #issue_number

[github-actions]

Benchmark for 076a5b3

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Test	Base	PR	%
Trie/cita-trie insert 10k	35.2±0.94ms	35.0±0.70ms	-0.57%
Trie/cita-trie insert 1k	3.5±0.01ms	3.6±0.12ms	+2.86%
Trie/ethrex-trie insert 10k	65.8±0.66ms	66.7±1.44ms	+1.37%
Trie/ethrex-trie insert 1k	8.3±0.04ms	7.1±0.03ms	-14.46%

[github-actions]

Benchmark for ba604c7

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Test	Base	PR	%
Trie/cita-trie insert 10k	34.5±0.52ms	34.7±0.20ms	+0.58%
Trie/cita-trie insert 1k	3.5±0.07ms	3.6±0.10ms	+2.86%
Trie/ethrex-trie insert 10k	65.4±0.27ms	65.6±0.73ms	+0.31%
Trie/ethrex-trie insert 1k	8.3±0.02ms	7.0±0.14ms	-15.66%

[github-actions]

Benchmark Block Execution Results Comparison Against Main

Command	Mean [s]	Min [s]	Max [s]	Relative
base	90.180 ± 0.142	89.996	90.468	1.02 ± 0.00
head	88.088 ± 0.094	87.938	88.234	1.00