chore: remove unnecessary test case

on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>

cypress/integration/rendering/block.spec.js

@@ -404,16 +404,6 @@ describe('Block diagram', () => {
   a
   b
   a --- b
-`,
-      {}
-    );
-  });
-  it('BL32: edge with arrow syntax should render with arrowheads', () => {
-    imgSnapshotTest(
-      `block-beta
-  a
-  b
-  a --> b
 `,
       {}
     );