[fetch] consider reordering manual and follow redirect flag cases in http fetch (#107)

The http fetch algorithm has 5 sub steps for the "follow" redirect flag and only a single step for the "manual" redirect flag.  Currently the algorithm is written such that "follow" is considered first.  It would be slightly nicer to handle "manual" first instead since its easier to short circuit on the short step.

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Reply to this email directly or view it on GitHub:
https://github.com/whatwg/fetch/issues/107