fix: Remove invalid key from firecrawl request payload. (#25190)

Signed-off-by: SUGIYAMA Yoshio <nenegi.01mo@gmail.com>

api/core/rag/extractor/firecrawl/firecrawl_app.py

             "formats": ["markdown"],
             "onlyMainContent": True,
             "timeout": 30000,
-            "integration": "dify",
         }
         if params:
             json_data.update(params)
     def crawl_url(self, url, params=None) -> str:
         # Documentation: https://docs.firecrawl.dev/api-reference/endpoint/crawl-post
         headers = self._prepare_headers()
-        json_data = {"url": url, "integration": "dify"}
+        json_data = {"url": url}
         if params:
             json_data.update(params)
         response = self._post_request(f"{self.base_url}/v1/crawl", json_data, headers)
             "timeout": 60000,
             "ignoreInvalidURLs": False,
             "scrapeOptions": {},
-            "integration": "dify",
         }
         if params:
             json_data.update(params)