systemd: re-exclude kernel-install from patchShebangs

Even though kernel-install was rewritten in C and is thus not a script
anymore that needs to be patched, there are still .install scripts in
the kernel-install directory that need to be patchd.

pkgs/os-specific/linux/systemd/default.nix

@@ -368,7 +368,7 @@ stdenv.mkDerivation (finalAttrs: {
   # when cross-compiling.
   + ''
     shopt -s extglob
-    patchShebangs tools test src/!(rpm|ukify) src/kernel-install/test-kernel-install.sh
+    patchShebangs tools test src/!(rpm|kernel-install|ukify) src/kernel-install/test-kernel-install.sh
   '';
 
   outputs = [ "out" "man" "dev" ];