fastn.dynamic-urls should give precedence to real files

[siddhantk232]

;; FASTN.ftd
-- import: fastn

-- fastn.package: test

-- fastn.dynamic-urls:

# handler
url: /handler/<string:id>/
document: handler/main.ftd

;; handler/main.ftd
-- import: fastn/processors

-- string id:
$processor$: processors.request-data


-- ftd.text: # Handler all for
-- ftd.text: $id

;; handler/new.ftd
-- ftd.text: # New handler

Visiting /handler/new/ should render the handler/new.ftd but it renders handler/main.ftd file with "new" passed as id.