Fallback to supplied token

[ferhatelmas]

Since there is no url parameters in this endpoint, feed id extraction isn't automatic in the backend and we use getOrCreateToken but it won't leverage if custom token is given to feed constructor.

Fixes #436

[github-actions]

Size Change: +13 B (0%)

Total Size: 95.6 kB

Filename	Size	Change
dist/js_min/getstream.js	29.8 kB	+6 B (0%)
dist/js/getstream.js	65.8 kB	+7 B (0%)

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