test: switch from nm to dhcp

Signed-off-by: aottr <[e-mail]>

hosts/polecat/configuration.nix

···
 
   networking = {
     hostName = "polecat";
-    networkmanager.enable = true;
+    networkmanager.enable = false;
     domain = "otter.place";
-    useDHCP = false;
+    useDHCP = true;
     useNetworkd = true;
   };
-  systemd.services.systemd-networkd-wait-online.enable = false;
 
   time.timeZone = "Europe/Paris";