Revert "fmt ff/src/fields/models/fp/mod.rs" #2903

Job	Run time
Check Documentation	1m 0s
Check (stable)	7s
Check (nightly)	1m 17s
List directories for parallelizing tests	2s
Check no_std	50s
Check Style	13s
Test (stable)	9m 25s
Test assembly	8m 37s
Test (cp6_782/)	7s
Test (nightly)	18m 1s
Test (mnt4_753/)	16s
Test (mnt6_753/)	13s
Test (./ed25519)	1m 5s
Test (./mnt6_298)	5m 35s
Test (./grumpkin)	1m 11s
Test (./ed_on_cp6_782)	1m 14s
Test (./ed_on_mnt4_753)	3m 47s
Test (./ed_on_bw6_761)	41s
Test (./bls12_381)	3m 18s
Test (./ed_on_bls12_381_bandersnatch)	1m 5s
Test (./ed_on_mnt4_298)	1m 12s
Test (./secq256k1)	1m 4s
Test (./bn254)	2m 27s
Test (./mnt4_298)	3m 57s
Test (./secp256r1)	1m 0s
Test (./vesta)	1m 12s
Test (./ed_on_bn254)	1m 1s
Test (./bw6_761)	4m 6s
Test (./curve25519)	1m 14s
Test (./pallas)	1m 12s
Test (./ed_on_bls12_377)	1m 9s
Test (./secp384r1)	1m 33s
Test (./secp256k1)	1m 12s
Test (./ed_on_bls12_381)	1m 23s
Test (./bls12_377)	4m 22s
Test (./bw6_767)	4m 17s
	1h 30m 25s

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