fix(monorepo-gerrit): Do not place hooks in $out/bin

Gerrit does not expect a bin/ there.

Change-Id: I907f96690b8c6bb614dc11889712d7b122c5d5cf
Reviewed-on: https://cl.tvl.fyi/c/depot/+/181
Reviewed-by: tazjin <mail@tazj.in>

ops/nixos/modules/monorepo-gerrit.nix

@@ -4,8 +4,8 @@
 let
   cfg = config.services.gerrit;
   gerritHooks = pkgs.runCommandNoCC "gerrit-hooks" {} ''
-    mkdir -p $out/bin
-    ln -s ${config.depot.ops.besadii}/bin/besadii $out/bin/ref-updated
+    mkdir -p $out
+    ln -s ${config.depot.ops.besadii}/bin/besadii $out/ref-updated
   '';
 in {
   services.gerrit = {