Fix canvas size to avoid aliasing

Author: virtuaCode

jsdecoder/gameboy_printer_js_decoder.html

@@ -1219,7 +1219,7 @@
 
 <br>
 <input id="submit_button" type="button" value="Click to Update Gameboy Tile"><br/><br/>
-<canvas id="demo_canvas" width="500" height="500" style="image-rendering: pixelated">
+<canvas id="demo_canvas" width="480" height="432" style="image-rendering: pixelated">
   Your browser doesn't support the HTML5 canvas :(
 </canvas>
 </div>