ridiculousfish 97dd5ece26 Remove redirection_is_to_real_file
This was previously required so that, if there was a redirection to a
file, we would fork a process to create the file even if there was no
output. For example `echo -n >/tmp/file.txt` would have to create
file.txt even though it would be empty.

However now we open the file before fork, so we no longer need special
logic around this.
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