Fix f-string handling

app.py

@@ -167,7 +167,7 @@ def execute_request(ids: list[str], mailto: str | None) -> list[Work]:
         raise ValueError("querying /works endpoint with more than 100 works")
 
     # query with the /works endpoint with a specific list of IDs and fields
-    search_filter = f"openalex_id:{"|".join(ids)}"
+    search_filter = f'openalex_id:{"|".join(ids)}'
     search_select = ",".join(["id"] + Work.get_raw_fields())
     params = {"filter": search_filter, "select": search_select, "per-page": 100}
     if mailto is not None: