Pass version and yarn hash to override

mastodon.nix

@@ -7,6 +7,8 @@ let
 
   mastodon-lor-sh = pkgs.mastodon.override {
     srcOverride = pkgs.applyPatches {
+      version = mastodon-source.version;
+      yarnHash = mastodon-source.yarnHash;
       src = pkgs.fetchFromGitHub {
         owner = mastodon-source.src.owner;
         repo = mastodon-source.src.repo;