firefox-extensions: fix the update script to not grab betas for u-block

pkgs/additional/firefox-extensions/default.nix

@@ -1,11 +1,13 @@
 { stdenv
 , callPackage
 , concatTextFile
+, fetchpatch
 , fetchurl
 , gnused
 , jq
 , lib
 , newScope
+, nix-update
 , nix-update-script
 , runCommandLocal
 , strip-nondeterminism
@@ -15,6 +17,18 @@
 , zip
 }:
 let
+  nix-update' = nix-update.overrideAttrs (upstream: {
+    patches = (upstream.patches or []) ++ [
+      (fetchpatch {
+        # u-block releases betas, and worse, deletes them later.
+        # i don't know how to ignore them through the nix-update-script API,
+        # but this patch handles that.
+        name = "github: Use API to properly tag prereleases";
+        url = "https://github.com/Mic92/nix-update/pull/246.patch";
+        hash = "sha256-cwajliS1YMEcS2MtrKtpNn64rWHjwNDLI49LKhnlQYM=";
+      })
+    ];
+  });
   wrapAddon = addon: args:
   let
     extid = addon.passthru.extid;
@@ -111,15 +125,7 @@ let
       cp $src $out
     '';
 
-    passthru.updateScript = nix-update-script {
-      extraArgs = [
-        # uBlock mixes X.YY.ZbN and X.YY.ZrcN style.
-        # default nix-update accepts the former but rejects the later as unstable.
-        # that's problematic because beta releases later get pulled.
-        # ideally i'd reject both, but i don't know how.
-        "--version=unstable"
-      ];
-    };
+    passthru.updateScript = (nix-update-script.override { nix-update = nix-update'; }) { };
     passthru.extid = extid;
   };