Add warning when using `--stats-one-line` without `--stats`

Before you start

• I have searched the forum and the existing issues and this hasn't already been requested.
• I have checked the latest beta and this feature doesn't already exist.

Associated forum post URL

No response

rclone version

rclone v1.74.3

• os/version: debian 13.6 (64 bit)
• os/kernel: 6.12.107+deb13-amd64 (x86_64)
• os/type: linux
• os/arch: amd64
• go/version: go1.26.4
• go/linking: static
• go/tags: none

What problem are you trying to solve?

--stats-one-line requires --stats to do anything. If you don't pass --stats the --stats-one-line flag is silently ignored.

How do you think rclone should be changed to solve that?

Printing a console warning to let the user know they need to use --stats

Getting involved

• I'm willing to help implement, test or fund this feature.