Remove Renderer field from GraphicsFunContext

- Only decorationsEnable & blackDecorations were ever read, graphics update functions shouldn't really be aware of the renderer.
 - `sim` should ideally not be there either, but `luaGraphicsWrapper` has more going on to sort out
 - Re-format previous commit with tabs instead of spaces

src/graphics/Renderer.h

@@ -19,8 +19,8 @@ struct Particle;
 struct GraphicsFuncContext
 {
 	const Simulation *sim;
-    bool decorationsEnable;
-    bool blackDecorations;
+	bool decorationsEnable;
+	bool blackDecorations;
 	RNG rng;
 	const Particle *pipeSubcallCpart;
 	Particle *pipeSubcallTpart;