Fixes #5172 Fix curly bracket in regexp of @list_route #5177
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Fixes #5172
if url_path contains curly brackets, these raise error while url_path.format() .
ex.
'{router_url}/(?P<year>[0-9]{4}){trailing_slash}'.format(router_url='some_url', trailing_slash='/')
{4} inside regex raise IndexError
so it need to replace single curly bracket to double.