core: fix path in get_local_path:

`local_dir` was not used in final path, resulting in workind dir used instead or actual
local path.

libervia/backend/core/main.py

@@ -908,7 +908,7 @@ class LiberviaBackend(service.Service):
         local_dir = self.memory.config_get("", "local_dir")
         if not local_dir:
             raise exceptions.InternalError("local_dir must be set")
-        path_elts = []
+        path_elts = [local_dir]
         if component:
             path_elts.append(C.COMPONENTS_DIR)
         path_elts.append(regex.path_escape(dir_name))