fix: align seek position and startTime handling

[Tomato6966]

Fix seeking issue. (untested yet)

seek requests were received, but the stream layer could lose the requested offset because position / startTime handling was inconsistent, so playback restarted at 0.

[github-actions]

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[Tomato6966]

I have read the CLA Document and I hereby sign the CLA

[Tomato6966]

I have tested it. and now it works.

[Tomato6966]

There is still a slight issue with seeking related to eqs. but i think this is a my issue from the implementation. or it's an issue with the sending of the position cause on lavalink it works...
but this should be handled seperately and isn't very important.

On lavalink in order to apply filters "instantly" you were required to run a seek right after the filters.
I seem to have found, that this is not required on nodelink. good job.

[1Lucas1apk]

Thank you for the pull request and for finding the bug, I'm very grateful :) Have a great day!