Remove fixed workaround in `impl_runtime_apis` #3130

Job	Run time
preflight / preflight	47s
preflight / ci-versions	1m 2s
check-runtime-assets	3m 5s
check-runtime-bridge-hubs	5m 17s
check-runtime-starters	2m 54s
check-runtime-coretime	2m 53s
check-runtime-collectives	2m 52s
check-runtime-testing	2m 54s
check-runtime-contracts	2m 53s
All check-runtime-* tests passed	1s
	24m 38s

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