fix: don't run middleware in Sinatra when not configured #629
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While #549 has removed middleware loading for Rails unless configured, it has also removed the code that prevented the middleware from executing in other frameworks unless configured i.e.
return @app.call(env) unless config[:FLAG]
.A similar change to rails initializer in #549 is now also required for Sinatra (perhaps the same for Hanami?), because currently it loads and executes the feedback and user informer middleware even when they are not configured.