Add Arrowheads to Arrows (#2452)

Co-authored-by: dwelle <luzar.david@gmail.com>
Co-authored-by: Lipis <lipiridis@gmail.com>

src/tests/helpers/api.ts

@@ -130,6 +130,8 @@ export class API {
       case "draw":
         element = newLinearElement({
           type: type as "arrow" | "line" | "draw",
+          startArrowhead: null,
+          endArrowhead: null,
           ...base,
         });
         break;