Initialize `split_dir` in `make_node`
Initialize `split_dir` in `make_node`

Fixes #308.

nfnty/bspwm,nfnty/bspwm,medisun/bspwm,medisun/bspwm,Stebalien/bspwm,JBouron/bspwm,Stebalien/bspwm,baskerville/bspwm,JBouron/bspwm,nfnty/bspwm,baskerville/bspwm,JBouron/bspwm,medisun/bspwm