make.js: move the make all target lower and remove one unneeded CD call
make.js: move the make all target lower and remove one unneeded CD call

FeodorFitsner/mpc-hc.org,FeodorFitsner/mpc-hc.org,Underground78/mpc-hc.org,mpc-hc/mpc-hc.org,kasper93/mpc-hc.org,mpc-hc/mpc-hc.org,kasper93/mpc-hc.org,Underground78/mpc-hc.org,FeodorFitsner/mpc-hc.org,mpc-hc/mpc-hc.org,Underground78/mpc-hc.org