Don't double-encode file paths

Broken by https://github.com/zotero/zotero/commit/82448c4a4d367e4e17382ae0c458bdaef3e59d45. Sorry about that.

This also voids https://github.com/aurimasv/translators/commit/b931e43b0229792190704a48dc6944aca729a06a