Update ex.Canvas snippet

Author: eonarheim

src/canvas/main.ts

@@ -7,6 +7,8 @@ const game = new ex.Engine({
 
 // start-snippet{canvas}
 const canvas = new ex.Canvas({
+    width: 200,
+    height: 200,
     cache: true,  // If true draw once until flagged dirty again, otherwise draw to Canvas every frame
     draw: (ctx) => {
         console.log('With cache=true I draw once');