make SpritePrimitive take less space (52 -> 48 bytes)

src/rendering/twn_draw_c.h

@@ -37,12 +37,13 @@ typedef struct SpritePrimitive {
     Color color;
     float rotation;
     TextureKey texture_key;
-    bool flip_x;
-    bool flip_y;
-    bool repeat;
 
     m_option_list(
         Rect, texture_region )
+
+    bool flip_x;
+    bool flip_y;
+    bool repeat;
 } SpritePrimitive;
 
 typedef struct RectPrimitive {