Instead of checking, if *any* qutebrowser process is running (which may or may not have an IPC socket where we expect it), simply launch a new instance *if socat fails*.
Which it does, if:
* the socket file doesn't exist (qutebrowser simply not running), or
* the socket isn't connectable (qutebrowser crashed, left orphaned socket)
Also put new instances into background, so the script behaves a bit more consistently. (Else it *sometimes* blocks and *sometimes doesn't*, when run.)
e8db59a9ef