docs: update requestListSources input screenshot (#1259)

Update docs input screenshot based on
apify/apify-core#17671 and
apify/apify-core#17718

<img width="815" alt="Screenshot 2024-10-21 at 13 52 37"
src="https://github.com/user-attachments/assets/27f5ad32-17c7-4fbd-88e0-73b3182a8574">

Author: mfori

sources/platform/actors/development/actor_definition/input_schema/images/input-schema-start-urls.png

@@ -342,7 +342,7 @@ Example of request list sources configuration:
     "title": "Start URLs",
     "type": "array",
     "description": "URLs to start with",
-    "prefill": [{ "url": "http://example.com" }],
+    "prefill": [{ "url": "https://apify.com" }],
     "editor": "requestListSources"
 }
 ```