tests: remove unwanted secp256k1_fe_normalize_weak call

It is not neccessary for the second argument in `secp256k1_fe_equal_var`
(or `secp256k1_fe_equal`) to have magnitude = 1.
Hence, removed the `secp256k1_fe_normalize_weak` call for those argument.

src/tests_exhaustive.c

@@ -52,9 +52,9 @@ static void ge_equals_gej(const secp256k1_ge *a, const secp256k1_gej *b) {
     /* Check a.x * b.z^2 == b.x && a.y * b.z^3 == b.y, to avoid inverses. */
     secp256k1_fe_sqr(&z2s, &b->z);
     secp256k1_fe_mul(&u1, &a->x, &z2s);
-    u2 = b->x; secp256k1_fe_normalize_weak(&u2);
+    u2 = b->x;
     secp256k1_fe_mul(&s1, &a->y, &z2s); secp256k1_fe_mul(&s1, &s1, &b->z);
-    s2 = b->y; secp256k1_fe_normalize_weak(&s2);
+    s2 = b->y;
     CHECK(secp256k1_fe_equal_var(&u1, &u2));
     CHECK(secp256k1_fe_equal_var(&s1, &s2));
 }