Fix cppcheck errors

include/GameEngine.h

@@ -75,7 +75,8 @@ void clip_texture_render_rects_to_drawing_area(RenderRect *src,
                                                RenderRect *dest);
 
 RenderRect get_texture_asset_rect(AssetID id);
-void render_texture_asset(AssetID id, RenderRect *src, RenderRect *dest);
+void render_texture_asset(AssetID id, const RenderRect *src,
+                          const RenderRect *dest);
 void modulate_texture_color(AssetID id, SDL_Color color);
 void modulate_texture_alpha(AssetID id, u8 alpha);
 TextSize get_text_size_from_font_asset(AssetID id, const char *text);