Update main.rb (#8)

This works. I did find out in my testing that it might not set the zoom correct however as soon as you do zoom it works properly. Also odd aspect ratios (eg not my aspect ratio) cause the squares to be not so square

Reviewed-on: bionickatana/number_factory#8
Co-authored-by: nathan <nathan@hintonclan.org>
Co-committed-by: nathan <nathan@hintonclan.org>

main.rb

@@ -9,8 +9,8 @@ require './producer.rb'
 require './consumer.rb'
 
 # Viewport resolution
-WIDTH = 1920
-HEIGHT = 1080
+WIDTH = Gosu::screen_width
+HEIGHT = Gosu::screen_height
 BOX_SIZE = 64
 
 # Default game settings