commands: Ignore exec switch "--no-startup-id".
commands: Ignore exec switch "--no-startup-id".

When using an i3 config verbatim in sway this switch to exec or
exec_always might appear.

Before this patch the switch would be passed to /bin/sh, causing
an error, and the command would not be run.

SirCmpwn/sway,christophgysin/sway,4e554c4c/sway,taiyu-len/sway,ascent12/sway,christophgysin/sway,taiyu-len/sway,colemickens/sway,mikkeloscar/sway,johalun/sway,colemickens/sway,mikkeloscar/sway,taiyu-len/sway,ptMuta/sway,ascent12/sway,colemickens/sway,4e554c4c/sway,sleep-walker/sway,1ace/sway,crondog/sway,crondog/sway,ascent12/sway,1ace/sway,1ace/sway,sleep-walker/sway