refactor: use simplified expression (#865) #2966

Job	Run time
Check no_std	32s
Check (stable)	2m 19s
List directories for parallelizing tests	2s
Check (nightly)	1m 9s
Check Documentation	51s
Test (stable)	9m 11s
Check Style	14s
Test (nightly)	17m 28s
Test assembly	8m 23s
Test (cp6_782/)	28m 39s
Test (mnt4_753/)	14m 6s
Test (mnt6_753/)	26m 3s
Test (./ed_on_mnt4_753)	3m 45s
Test (./secp256r1)	1m 6s
Test (./ed_on_mnt4_298)	1m 9s
Test (./ed_on_cp6_782)	1m 14s
Test (./mnt4_298)	3m 47s
Test (./mnt6_298)	5m 19s
Test (./ed_on_bn254)	57s
Test (./bn254)	2m 27s
Test (./secp256k1)	1m 3s
Test (./bw6_761)	4m 3s
Test (./bls12_377)	4m 10s
Test (./grumpkin)	1m 7s
Test (./secp384r1)	1m 15s
Test (./ed_on_bls12_377)	1m 17s
Test (./secq256k1)	52s
Test (./ed25519)	54s
Test (./ed_on_bls12_381)	1m 16s
Test (./ed_on_bw6_761)	37s
Test (./curve25519)	1m 4s
Test (./ed_on_bls12_381_bandersnatch)	1m 6s
Test (./pallas)	1m 5s
Test (./vesta)	1m 4s
Test (./bw6_767)	4m 11s
Test (./bls12_381)	3m 12s
	2h 36m 57s

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