Use correct streaming server url

[edde746]

Fixes (kind of, changes to stremio-core-web are also required) Stremio/stremio-web#404 and (duplicate) Stremio/stremio-web#431.

[edde746]

To hopefully assist with reviewing this quicker, here are the steps to re-create the issue that this solves:

1. Run the stremio-server in a Docker container
2. Run the current version of stremio-web
3. Play a magnet link and click the "Copy stream link" button, it should give you the internal docker IP, something like http://172.17.0.2:11470/... when it's expected to be http://127.0.0.1/... or whatever the user set their streaming server to

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You can also test the fixed version with these changes implemented in my fork of stremio-web.

Here is a video showcasing the issue and the fix:

Screen.Recording.2023-11-07.at.15.48.36.mov