Revert "fmt ff/src/fields/models/fp/mod.rs" (#838) #2907

Job	Run time
Check Documentation	58s
Check (stable)	10s
Check (nightly)	1m 13s
Check Style	11s
List directories for parallelizing tests	2s
Test (stable)	9m 29s
Test (nightly)	17m 58s
Test (cp6_782/)	8s
Test (mnt4_753/)	13s
Test (mnt6_753/)	12s
Check no_std	23s
Test assembly	8m 32s
Test (./ed25519)	57s
Test (./mnt6_298)	5m 41s
Test (./grumpkin)	1m 8s
Test (./ed_on_cp6_782)	1m 27s
Test (./ed_on_mnt4_753)	4m 1s
Test (./ed_on_bw6_761)	48s
Test (./bls12_381)	3m 22s
Test (./ed_on_bls12_381_bandersnatch)	1m 16s
Test (./ed_on_mnt4_298)	1m 15s
Test (./secq256k1)	1m 15s
Test (./bn254)	2m 21s
Test (./mnt4_298)	3m 56s
Test (./secp256r1)	1m 2s
Test (./vesta)	1m 10s
Test (./ed_on_bn254)	1m 9s
Test (./bw6_761)	4m 2s
Test (./curve25519)	1m 11s
Test (./pallas)	1m 5s
Test (./ed_on_bls12_377)	1m 31s
Test (./secp384r1)	1m 24s
Test (./secp256k1)	1m 10s
Test (./ed_on_bls12_381)	1m 23s
Test (./bls12_377)	4m 17s
Test (./bw6_767)	4m 0s
	1h 30m 20s

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