Removed NWST_STEP and min_step, we don't need two variables doing the same thing

src/newgrf_debug_gui.cpp

@@ -864,7 +864,7 @@ struct SpriteAlignerWindow : Window {
 				break;
 			case WID_SA_LIST:
 				resize->height = FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
-				resize->height = GetMinSizing(NWST_STEP, resize->height);
+				resize->height = GetMinSizing(NWST_BUTTON, resize->height);
 				resize->width  = 1;
 				fill->height = resize->height;
 				break;