node_exporter: Disable rapl collector

It does not work since the service does not have permission and
therefore writes errors into the journal every scrape.

modules/prometheus/node_exporter.nix

@@ -4,6 +4,7 @@
     enable = config.sbruder.wireguard.home.enable;
     listenAddress = config.sbruder.wireguard.home.address;
     enabledCollectors = [ "systemd" ];
+    disabledCollectors = [ "rapl" ];
   };
 
   systemd.services.prometheus-node-exporter.after = [ "wireguard-wg-home.service" ];