Demos: Fix a typo with an extra semicolon

Closes gh-1812

Author: robertbrignull

demos/effect/easing.html

@@ -34,7 +34,7 @@
 			canvas.width = width;
 			canvas.height = height;
 			var drawHeight = height * 0.8,
-				cradius = 10;
+				cradius = 10,
 				ctx = canvas.getContext( "2d" );
 			ctx.fillStyle = "black";