Proxmox Backup Server Renaming and Update fix (#2012)

* Remaned PBS to long name Proxmox Backup Server and fixed install check

* Fix Name

json/proxmox-backup-server.json

@@ -1,12 +1,12 @@
 {
     "name": "Proxmox Backup Server",
-    "slug": "pbs",
+    "slug": "proxmox-backup-server",
     "categories": [
         1
     ],
     "date_created": "2024-05-02",
     "type": "ct",
-    "updateable": false,
+    "updateable": true,
     "privileged": false,
     "interface_port": 8007,
     "documentation": "https://pbs.proxmox.com/docs/",
@@ -16,7 +16,7 @@
     "install_methods": [
         {
             "type": "default",
-            "script": "ct/pbs.sh",
+            "script": "ct/proxmox-backup-server.sh",
             "resources": {
                 "cpu": 2,
                 "ram": 2048,
@@ -27,12 +27,12 @@
         }
     ],
     "default_credentials": {
-        "username": null,
+        "username": "root",
         "password": null
     },
     "notes": [
         {
-            "text": "Set a root password if using autologin. This will be the PBS password. `sudo passwd root`",
+            "text": "Set a root password if using autologin. This will be the PBS password. `passwd root`",
             "type": "warning"
         }
     ]