Fixed double encoding in directory listings when directory name contains spaces

[VilleSalonen]

If a directory listing was requested for a directory with spaces in its name, already escaped url was combined with the file names.

Expected: subdir_with%20spaces\file_with%20space.html
Got:      subdir_with%2520spaces\file_with%20space.html

[jfhbrook]

I'm concerned about the replace being missing. Otherwise, I'll try to give this some TLC later in the week.