Set Debian version to 12 and drop Java setup

Align defaults to Debian 12 and remove the explicit Java setup call from the installer. Updated ct/jitsi-meet.sh to default var_version to 12, json/jitsi.json to reflect version "12", and removed the `JAVA_VERSION=17 setup_java` line from install/jitsi-meet-install.sh so Java is no longer forced by the installer.

ct/jitsi-meet.sh

@@ -12,7 +12,7 @@ var_cpu="${var_cpu:-4}"
 var_ram="${var_ram:-4096}"
 var_disk="${var_disk:-12}"
 var_os="${var_os:-debian}"
-var_version="${var_version:-13}"
+var_version="${var_version:-12}"
 var_unprivileged="${var_unprivileged:-1}"
 
 header_info "$APP"

install/jitsi-meet-install.sh

@@ -17,8 +17,6 @@ msg_info "Installing Dependencies"
 $STD apt install -y nginx
 msg_ok "Installed Dependencies"
 
-JAVA_VERSION=17 setup_java
-
 source /etc/os-release
 setup_deb822_repo "prosody" "https://prosody.im/files/prosody-debian-packages.key" "http://packages.prosody.im/debian" "${VERSION_CODENAME}" "main"
 setup_deb822_repo "jitsi" "https://download.jitsi.org/jitsi-key.gpg.key" "https://download.jitsi.org/stable" "./"

json/jitsi.json

@@ -23,7 +23,7 @@
                 "ram": 4096,
                 "hdd": 12,
                 "os": "Debian",
-                "version": "13"
+                "version": "12"
             }
         }
     ],