Fix the incorrect `Affine - Projective` implementation (#822) #9

Job	Run time
Check (stable)	19s
List directories for parallelizing tests	2s
Check Documentation	1m 3s
Check (nightly)	26s
Check no_std	34s
Check Style	15s
Test assembly	8m 29s
Test (stable)	30s
Test (cp6_782/)	29m 6s
Test (nightly)	25s
Test (mnt4_753/)	10m 50s
Test (mnt6_753/)	22m 9s
Test (./ed_on_bls12_381)	1m 23s
Test (./curve25519)	1m 10s
Test (./mnt6_298)	5m 42s
Test (./bls12_377)	4m 19s
Test (./bw6_767)	3m 57s
Test (./ed_on_cp6_782)	1m 15s
Test (./secq256k1)	55s
Test (./secp256r1)	55s
Test (./pallas)	1m 14s
Test (./ed_on_mnt4_298)	1m 18s
Test (./ed25519)	1m 1s
Test (./ed_on_bls12_377)	1m 3s
Test (./ed_on_bls12_381_bandersnatch)	1m 4s
Test (./ed_on_mnt4_753)	4m 3s
Test (./bw6_761)	4m 2s
Test (./bls12_381)	3m 14s
Test (./ed_on_bn254)	1m 8s
Test (./secp256k1)	1m 13s
Test (./ed_on_bw6_761)	35s
Test (./grumpkin)	1m 14s
Test (./secp384r1)	1m 20s
Test (./mnt4_298)	3m 50s
Test (./vesta)	1m 17s
Test (./bn254)	2m 16s
	2h 3m 36s

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