Request: Allow "source and parameter to --backup-dir" to overlap, if --exclude "/backup-dir/**" is set

Feature
3 
rclone v1.61.1
- os/version: Microsoft Windows Server 2012 R2 Standard (64 bit)
- os/kernel: 6.3.9600.20821 (x86_64)
- os/type: windows
- os/arch: amd64
- go/version: go1.19.4
- go/linking: static
- go/tags: cmount

Thanks.Peet