fix dispatching using ++api++ url PUT, OPTIONS, PATCH, DELETE

[mamico]

Not all methods work correctly when using the ++api++ traverser instead of relying on the Accept header. The issue is that the request must be marked early in order to disable the maybe_webdav_client flag.

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[mamico]

@jenkins-plone-org please run jobs

[mamico]

@jenkins-plone-org please run jobs