swaybg: remove assertions with side-effects
swaybg: remove assertions with side-effects

ascent12/sway,1ace/sway,ascent12/sway,1ace/sway,ascent12/sway,taiyu-len/sway,SirCmpwn/sway,taiyu-len/sway,taiyu-len/sway,1ace/sway