`w`: Shows incorrect value in the `WHAT` column

There is a discrepancy in the information output by this implementation of `w` and the reference implementation: ```bash $ cargo run -q w 21:22:38 up 1:06, 1 user, load average: 0.09, 0.27, 0.58 USER TTY LOGIN@ IDLE JCPU PCPU WHAT alx tty1 20:16 1:06m 0.00 0 /bin/sh/usr/bin/niri-session-l $ w 21:22:38 up 1:06, 1 user, load average: 0.09, 0.26, 0.58 USER TTY LOGIN@ IDLE JCPU PCPU WHAT alx tty1 20:16 1:06m 0.00s ? systemctl --user --wait start niri.service ``` 1. The value of `WHAT` seems to be stripping away all whitespace from the command it's trying to display. `/bin/sh/usr/bin/niri-session-l` is clearly supposed to be this shell script invocation: `/bin/sh /usr/bin/niri-session -l` 2. The actual content of the column refers to two slightly different steps in the invocation chain. In this specific case `/usr/bin/niri-session` is a bash script which is invoked by the display manager at login-time. `systemctl --user --wait start niri.service` is something that is called from inside this bash script. Looking at these processes with `ps`, I can confirm that both are still running, and the `/bin/sh` invocation is indeed higher up in the invocation chain (it has a lower PID). Seeing how there's two different processes being shown in the `WHAT`, I'd also assume that the `PCPU` values would also have a discrepancy if they anything else than zero 🙂