Do not use worldgen executor for api profile completions

We cannot put blocking network I/O onto the worldgen threads,
this will crash the server if it stalls

patches/server/Basic-PlayerProfile-API.patch

@@ -185,7 +185,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            final CraftPlayerProfile clone = clone();
 +            clone.complete(true);
 +            return clone;
-+        }, Util.backgroundExecutor());
++        }, Util.PROFILE_EXECUTOR);
 +    }
 +
 +    @Override