fix: from_affine_point infinity definition (#542)

Author: tcoratger

starknet-curve/src/ec_point.rs

@@ -147,7 +147,7 @@ impl ProjectivePoint {
             x: p.x,
             y: p.y,
             z: FieldElement::ONE,
-            infinity: false,
+            infinity: p.infinity,
         }
     }