Change FIFO args to look like existing cmd args
Change FIFO args to look like existing cmd args

This commit changes the FIFO arguments to `inwee` to be shorter. Instead
of `-fp` or `--fifo-path`, we use `-f` and `--fifo` instead. This keeps
the arguments at a shorter length, which is more *consistent* with the
existing option arguments for inwee.

susam/inwee