Fix CSI Ps M to delete the correct line
Fix CSI Ps M to delete the correct line

sourcelair/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,xtermjs/xterm.js,akalipetis/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,sourcelair/xterm.js,Tyriar/xterm.js