Fix material demo lighting & wool material rim

also project.godot trailing spaces

3d/material_testers/project.godot

@@ -1,8 +1,8 @@
 ; Engine configuration file.
 ; It's best edited using the editor UI and not directly,
 ; since the parameters that go here are not all obvious.
-; 
-; Format: 
+;
+; Format:
 ;   [section] ; section goes between []
 ;   param=value ; assign values to parameters