Make renderer pointer const in load_asset_to_manager

include/AssetManager.h

@@ -35,7 +35,7 @@ AssetManager *create_asset_manager();
  * Returns the AssetID on success or an INVALID_ID in the case of failure.
  */
 AssetID load_asset_to_manager(AssetManager *am, const char *path,
-                              AssetType type, Renderer *renderer);
+                              AssetType type, const Renderer *renderer);
 
 /**
  * Removes an asset from the manager using its ID.

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;
   }