fix: ensure requestSync is set correctly in DocumentSchema

- Added a line to set payload.requestSync to true within the DocumentSchema class, ensuring that synchronization requests are properly flagged for processing.
- This change reinforces the handling of sync operations, aligning with previous optimizations made to the background synchronization process.

src/Document/document.schema.ts

@@ -774,9 +774,9 @@ export class DocumentSchema extends PothosSchema {
               //   payload.pageIndex,
               //   ctx
               // );
+              payload.requestSync = true;
             }
 
-            payload.requestSync = true;
             // biome-ignore lint/suspicious/noExplicitAny: error is any
           } catch (error: any) {
             Logger.error("Background sync check failed", {