fix: update uniqby key (#3518)

* Used correct uniqby key

* Put back filter

---------
Co-authored-by: Martin MacDonald <martinmacdonald@Martins-MacBook-Pro.local>

web/src/components/MemoEditor/ActionButton/AddMemoRelationButton.tsx

@@ -51,7 +51,7 @@ const AddMemoRelationButton = (props: Props) => {
               })),
               ...context.relationList,
             ].filter((relation) => relation.relatedMemo !== context.memoName),
-            "relatedMemoId",
+            "relatedMemo",
           ),
         );
       },