Add an extra bit to material flag cache

scene/resources/material.h

@@ -249,7 +249,7 @@ private:
 			uint64_t blend_mode : 2;
 			uint64_t depth_draw_mode : 2;
 			uint64_t cull_mode : 2;
-			uint64_t flags : 18;
+			uint64_t flags : 19;
 			uint64_t detail_blend_mode : 2;
 			uint64_t diffuse_mode : 3;
 			uint64_t specular_mode : 3;