refactor: streamline collaborator check in Document schema

- Simplified the collaborator check logic in the DocumentSchema by condensing the condition into a single line for improved readability.
- Maintained existing functionality while enhancing code clarity and maintainability.

src/Document/document.schema.ts

@@ -461,10 +461,7 @@ export class DocumentSchema extends PothosSchema {
           if (!document.isPublic) {
             if (
               document.ownerId !== ctx.websocket?.me?.id &&
-              !document.collaborators.some((c) => 
+              !document.collaborators.some((c) => c.userId === ctx.websocket?.me?.id && (c.writable || c.readable))
-                c.userId === ctx.websocket?.me?.id && 
-                (c.writable || c.readable)
-              )
             ) {
               throw new Error('User is not owner or collaborator of document')
             }