explicitly check error code instead of || true

overlays/firefox-search.nix

@@ -6,7 +6,11 @@
       export buildRoot="$(pwd)"
     '' + old.buildCommand + ''
       pushd $buildRoot
-      unzip $out/lib/firefox/browser/omni.ja -d patched_omni || true
+      unzip $out/lib/firefox/browser/omni.ja -d patched_omni || ret=$?
+      if [[ $ret && $ret -ne 2 ]]; then
+        echo "unzip exited with unexpected error"
+        exit $ret
+      fi
       rm $out/lib/firefox/browser/omni.ja
       cd patched_omni
       sed -i 's/"enterprise_only"\s*:\s*true,//' modules/policies/schema.sys.mjs

patches/firefox_search_engines.patch

@@ -1,21 +0,0 @@
-From f1c293daaf7c299b6ee81f76525371bb04516394 Mon Sep 17 00:00:00 2001
-From: Ryosuke Asano <ryosukeusuusu@gmail.com>
-Date: Thu, 20 Jul 2023 12:21:37 +0900
-Subject: [PATCH] [FB] Policies | Allow user can use Search engine policy
-
----
- .../components/enterprisepolicies/schemas/policies-schema.json   | 1 -
- 1 file changed, 1 deletion(-)
-
-diff --git a/browser/components/enterprisepolicies/schemas/policies-schema.json b/browser/components/enterprisepolicies/schemas/policies-schema.json
-index 75293fb9b1fb5..bc4b901b34583 100644
---- a/browser/components/enterprisepolicies/schemas/policies-schema.json
-+++ b/browser/components/enterprisepolicies/schemas/policies-schema.json
-@@ -1228,7 +1228,6 @@
-     },
- 
-     "SearchEngines": {
--      "enterprise_only": true,
- 
-       "type": "object",
-       "properties": {