FIX: correct change for issue 263

Was incorrectly handling DELETE and PUT methods in fileHandler.
FIX: Use original URI to build trailing slash redirects [issue 264]

https://github.com/embedthis/appweb-4/issues/264

When a prefix is removed, it may result in a URI that ends with “/“ whereas the original URI does not.

Also, the redirected URI should be based on the original URI and not the decoded pathInfo.