move 'wait_for_local_worker' from client to server

this just made no sense in the client

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/bin/proxmox-backup-manager.rs

@@ -12,6 +12,7 @@ use proxmox_backup::tools;
 use proxmox_backup::config;
 use proxmox_backup::api2::{self, types::* };
 use proxmox_backup::client::*;
+use proxmox_backup::server::wait_for_local_worker;
 
 mod proxmox_backup_manager;
 use proxmox_backup_manager::*;