debian-edu-config: Icinga2 config: check_disks without parameters must be removed

Package: src:debian-edu-config

Version: 2.12.44~deb12u1


Icinga2 has a separate "disk" service with no parameters.

root@tjener:/etc/icinga2/conf.d# cat hosts.conf | tail -16 | head -8

```
  /* Define disks and attributes for service apply rules in
`services.conf`. */
  vars.disks["disk"] = {
    /* No parameters. */
  }
  vars.disks["disk /"] = {
    disk_partitions = "/"
  }
```
Running "check_disk" without parameters doesn't make sense:
```
/usr/lib/nagios/plugins/check_disk
                                                         check_disk: Could
not parse arguments
Usage:
 check_disk {-w absolute_limit |-w  percentage_limit% | -W
inode_percentage_limit } {-c absolute_limit|-c percentage_limit% | -K
inode_percentage_limit } {-p path | -x device}
[-C] [-E] [-e] [-f] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ]
[-t timeout] [-u unit] [-v] [-X type_regex] [-N type]
```

In a web version (icingaweb2) it showed as a CRITICAL ERROR
Service: *disk*
DISK CRITICAL - /run/user/0/doc is not accessible


Sincerely,
Serhii Horichenko