main.c: Treat non-existing upload dir as non-fatal

When a user attempts to upload a file into a non-existing directory,
slcl would not check whether the directory exists. Then, rename(3) would
fail and slcl would treat this as a fatal error, effectively closing
itself.

Since this is an example of ill-formed user input, it must be treated as
a non-fatal error, and instead slcl should return a bad request page.

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