fix: fixed failing test cases

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

packages/mermaid/src/diagrams/sequence/sequenceDb.ts

@@ -270,7 +270,7 @@ export class SequenceDB implements DiagramDB {
       wrap: message?.wrap ?? this.autoWrap(),
       type: messageType,
       activate,
-      centralConnection,
+      centralConnection: centralConnection ?? 0,
     });
     return true;
   }