fix ipv6 handling for remotes/sync jobs

* add square brackets to ipv6 adresses in BackupRepository if they not
already have some (we save them without in the remote config)

* in get_pull_parameters, we now create a BackupRepository first and use
  those values (which does the [] mapping), this also has the advantage
  that we have one place less were we hardcode 8007 as port

* in the ui, add square brackets for ipv6 adresses for remotes

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/client/backup_repo.rs

@@ -28,6 +28,12 @@ pub struct BackupRepository {
 impl BackupRepository {
 
     pub fn new(user: Option<Userid>, host: Option<String>, port: Option<u16>, store: String) -> Self {
+        let host = match host {
+            Some(host) if (IP_V6_REGEX.regex_obj)().is_match(&host) => {
+                Some(format!("[{}]", host))
+            },
+            other => other,
+        };
         Self { user, host, port, store }
     }