Make renderer pointer const in load_asset_to_manager

src/AssetManager.c

@@ -71,7 +71,7 @@ AssetManager *create_asset_manager() {
 }
 
 AssetID load_asset_to_manager(AssetManager *am, const char *path,
-                              AssetType type, Renderer *renderer) {
+                              AssetType type, const Renderer *renderer) {
   if (!am || type == ASSET_TYPE_COUNT) {
     return INVALID_ID;
   }