nixos/nextcloud: fix missing quotes arround $* in occ wrapper and replace with $@

This will allow this to work:
    nextcloud-occ config:app:set theming slogan --value="A place for testing"

nixos/modules/services/web-apps/nextcloud.nix

@@ -39,7 +39,7 @@ let
     export NEXTCLOUD_CONFIG_DIR="${cfg.home}/config"
     $sudo \
       ${phpPackage}/bin/php \
-      occ $*
+      occ "$@"
   '';
 
   inherit (config.system) stateVersion;