[luxembourg] Move adminfront alias from cronos to pve-1

data/grid5000/sites/luxembourg/servers/cronos.json

 {
-  "alias": [
-    "adminfront",
-    "af"
-  ],
   "kind": "physical",
   "network_adapters": {
     "adm": {

data/grid5000/sites/luxembourg/servers/pve-1.json

 {
+  "alias": [
+    "adminfront",
+    "af"
+  ],
   "kind": "physical",
   "network_adapters": {
     "adm": {

input/grid5000/sites/luxembourg/servers/physical.yaml

@@ -2,7 +2,6 @@
 cronos:
   kind: physical
   redfish: false
-  alias: [adminfront, af]
   warranty: 2017-05
   serial: JSG625J
   network_adapters:
@@ -60,6 +59,7 @@ md1000:
 
 pve-1:
   kind: physical
+  alias: [adminfront, af]
   warranty: 2025-12-18
   serial: 3Q4TD93
   network_adapters: