[Nitro] web file directory fixes

[Robert Mela]

Is it still correct to spam the group with patches, or should I be 
sending them directly to George?

Anyhow, here are some fixes to get WebFile working with forms & Og

Two little things:

replace Nitro::Server.public_root with $nitro_current_application.public_dir
replace WebFile.upload_root with WebFile.upload_dir, since WebFile 
defines upload_dir but not upload_root
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