Fix nesting of getSubGraphTitleMargins test.

packages/mermaid/src/utils.spec.ts

@@ -595,6 +595,7 @@ describe('calculatePoint', () => {
       'Could not find a suitable point for the given distance'
     );
   });
+});
 
 describe('getSubGraphTitleMargins', () => {
   it('should get subgraph title margins after config has been set', () => {
@@ -615,4 +616,3 @@ describe('calculatePoint', () => {
     });
   });
 });
-});