networkmanager: remove restart after suspend from resume

In commit ec9dc73 restarting NetworkManager after resume from
suspend/hibernate was introduced.

When I initially switch to NixOS I started noticing a high delay between
wakeup and re-connecting to WiFi & wired networks. The delay increased
from a few seconds (on my previous distro, same software stack) to
almost half a minute with NixOS.

I (locally) applied the change in this commit a few weeks ago and tested
since then. The notebook/mobile device experience has improved a lot.
Reconnects are as before switching to NixOS.

Issue #24401 could be related to this. Since I am not using KDE/plasma5
I can only guess…

nixos/modules/services/networking/networkmanager.nix

@@ -333,10 +333,6 @@ in {
       wireless.enable = lib.mkDefault false;
     };
 
-    powerManagement.resumeCommands = ''
-      ${config.systemd.package}/bin/systemctl restart network-manager
-    '';
-
     security.polkit.extraConfig = polkitConf;
 
     services.dbus.packages = cfg.packages;