Apply colorShader once instead of every frame

[AbnormalPoof]

Week 5 Erect's stage has this:

override function addCharacter(character:BaseCharacter, charType:CharacterType):Void {
	// Apply the shader automatically to each character as it gets added.
	super.addCharacter(character, charType);
	trace('Applied stage shader to ' + character.characterName);
	character.shader = colorShader;
}

This applies the shader when a character is added instead of only BF, GF, and Dad. So pretty much any character type can have the shader.
I updated the rest of the stage scripts to do something similar instead of applying the shader every frame.

I tested the stages and everything works fine.