[FIX] core: disable werkzeug's `merge_slashes`

Werkzeug 1.0 adds a `merge_slashes` feature which calls rule.build()
*during match*[0] (= during dispatch).

However at this point our environment still contains an invalid /
placeholder UID, so `display_name` / `name_get()` fails dramatically.

One possibility would be to update the slugifying to not access the
record (outside of the id) if the environment is not "proper", an
other alternative is to just disable the feature since it seems to not
have been necessary so far.

The latter seems less hacky so do that for now, we can always swap the
solution later if we need to.

[0] https://github.com/pallets/werkzeug/blame/048cdfd9b969c0c3a133d7ff43b8ad1ad6a673ec/src/werkzeug/routing.py#L904

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