Ghetto Banana Lamp

 -Removed the duplicated brightness on the green desk lamp, as it will inherit
  the brightness from the foremost.
 +Added the coding for the Banana Lamp

lighting.dmi
 +Added a new sprite for the lamp: A ghetto Banana Lamp!
The brightness_on = 5 was meant to be moved here I believe because both the banana lamp and green lamp inherits from this