Remove unused ScreenLayout#window.graphics

why was that even there?

js/term/debug.js

@@ -366,9 +366,9 @@ module.exports = function attachDebugger (screen, connection) {
 
     let fancyGraphics = document.createElement('input')
     fancyGraphics.type = 'checkbox'
-    fancyGraphics.value = !!screen.layout.window.graphics
+    fancyGraphics.value = !!screen.layout.renderer.graphics
     fancyGraphics.addEventListener('change', e => {
-      screen.layout.window.graphics = +fancyGraphics.checked
+      screen.layout.renderer.graphics = +fancyGraphics.checked
     })
 
     toolbarData = {
@@ -465,7 +465,7 @@ module.exports = function attachDebugger (screen, connection) {
 
     let drawTime = Math.round((drawData.endTime - drawData.startTime) * 100) / 100
     toolbarData.drawing['Last Update'] = `${drawData.reason} (${drawTime}ms)`
-    toolbarData.drawing['Fancy Graphics'].checked = !!screen.layout.window.graphics
+    toolbarData.drawing['Fancy Graphics'].checked = !!screen.layout.renderer.graphics
 
     for (let i in toolbarData) {
       let group = toolbarData[i]

js/term/screen_layout.js

@@ -22,7 +22,6 @@ module.exports = class ScreenLayout extends EventEmitter {
       gridScaleY: 1.2,
       fitIntoWidth: 0,
       fitIntoHeight: 0,
-      graphics: 0,
       debug: false
     }