refactor: use simplified expression #2964

Job	Run time
Check Style	7s
Check (stable)	2m 28s
Test (stable)	8m 58s
Check (nightly)	1m 11s
Check Documentation	59s
Test (nightly)	17m 33s
Check no_std	29s
List directories for parallelizing tests	5s
Test assembly	8m 21s
Test (cp6_782/)	28m 45s
Test (mnt4_753/)	13m 56s
Test (mnt6_753/)	25m 45s
Test (./ed_on_mnt4_753)	3m 49s
Test (./secp256r1)	1m 6s
Test (./ed_on_mnt4_298)	1m 4s
Test (./ed_on_cp6_782)	1m 14s
Test (./mnt4_298)	3m 52s
Test (./mnt6_298)	5m 23s
Test (./ed_on_bn254)	57s
Test (./bn254)	2m 14s
Test (./secp256k1)	1m 6s
Test (./bw6_761)	3m 55s
Test (./bls12_377)	4m 9s
Test (./grumpkin)	1m 16s
Test (./secp384r1)	1m 17s
Test (./ed_on_bls12_377)	1m 33s
Test (./secq256k1)	1m 11s
Test (./ed25519)	1m 1s
Test (./ed_on_bls12_381)	1m 9s
Test (./ed_on_bw6_761)	43s
Test (./curve25519)	1m 10s
Test (./ed_on_bls12_381_bandersnatch)	1m 2s
Test (./pallas)	1m 18s
Test (./vesta)	1m 8s
Test (./bw6_767)	4m 9s
Test (./bls12_381)	3m 11s
	2h 37m 34s

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