FIX: Playwright Timeout (ms) interpreted as seconds

Fix for Playwright Timeout (ms) interpreted as seconds.

To address https://github.com/open-webui/open-webui/issues/16801

In Frontend Playwright Timeout is setted as (ms), but in backend is interpreted as (s) doing a time conversion for playwright_timeout var (that have to be in ms).

& as  _Originally posted by @rawbby in [#16801](https://github.com/open-webui/open-webui/issues/16801#issuecomment-3216782565)_

> I personally think milliseconds are a reasonable choice for the timeout. Maybe the conversion should be fixed, not the label.
> This would further not break existing configurations from users that rely on their current config.
>

backend/open_webui/retrieval/web/utils.py

@@ -614,7 +614,7 @@ def get_web_loader(
         WebLoaderClass = SafeWebBaseLoader
     if WEB_LOADER_ENGINE.value == "playwright":
         WebLoaderClass = SafePlaywrightURLLoader
-        web_loader_args["playwright_timeout"] = PLAYWRIGHT_TIMEOUT.value * 1000
+        web_loader_args["playwright_timeout"] = PLAYWRIGHT_TIMEOUT.value
         if PLAYWRIGHT_WS_URL.value:
             web_loader_args["playwright_ws_url"] = PLAYWRIGHT_WS_URL.value