Use indicator border color only when needed.
Use indicator border color only when needed.

Indicator border color is now used only when a container is the only
child. Reason for the change? i3 does it this way. Sway container
borders are now a bit more similar to i3 ones.

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