[AdminBundle] fixed base route name for exception admin lists

[virtualize]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Fixed tickets

I don't know if this the admin list for exceptions is still used. Or if exceptions are still logged in 7.1. Maybe it's deprecated and there's a config flag to disable it. Haven't found anything on the docs.

Anyway, in our admin UI there's a menu entry for it that throws route-not-found exceptions. So here is a fix for it.

[acrobat]

Thanks @virtualize. You can disable the cms error logging with the kunstmaan_admin.exception_logging.enabled: false if you don't need it in your application because you use sentry for example.