When -o is set, create the output file if it does not exist about broot HOT 2 CLOSED

I didn't expect that people would want to have a file dynamically created this way, but I see no harm in creating the file if it doesn't exist.

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My use case is I occasionally will use br -o /tmp/tmpfile or br -c "somefile :print_path" -o /tmp/tmpfiile to get the path into a file that I can pipe into some arbitrary program, since there is no way to capture the output of broot directly. This was brought up in #25 and this was my best solution to obtaining the path of the selected file.

The reason I sometimes use a different tmpfile is that -o always appends to the target file (although I suppose I could just ensure my function deletes the file after each use, but I also sometimes use the path multiple times).

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