Update cell.sh (#27055)

You can combine the two nmcli commands into a single command by specifying both ipv4 and ipv6 options at the same time.

You can use the nmcli command with the --wait option to wait for the connection to be fully established before exiting.

You can use nmcli command with the --ask option to prompt the user to confirm the action before proceeding.
old-commit-hash: f5d253764c

scripts/cell.sh

@@ -1,5 +1,3 @@
 #!/usr/bin/bash
-
-nmcli connection modify --temporary lte ipv4.route-metric 1
-nmcli connection modify --temporary lte ipv6.route-metric 1
-nmcli con up lte
+nmcli connection modify --temporary lte ipv4.route-metric 1 ipv6.route-metric 1
+nmcli con up --wait --ask lte