Demos: Fix a typo with an extra semicolon

Closes jquerygh-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";