Fingerprint: add new signature method

commit c42a54795d introcuded a bug by
using fp.to_string(). Replace this with fp.signature() which correctly
returns the full fingerprint instead of the short version.

Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>

pbs-config/src/key_config.rs

@@ -100,7 +100,7 @@ impl From<&KeyConfig> for KeyInfo {
             fingerprint: key_config
                 .fingerprint
                 .as_ref()
-                .map(|fp| fp.to_string()),
+                .map(|fp| fp.signature()),
             hint: key_config.hint.clone(),
         }
     }

pbs-config/src/tape_encryption_keys.rs

@@ -190,5 +190,5 @@ pub fn complete_key_fingerprint(_arg: &str, _param: &HashMap<String, String>) ->
         Err(_) => return Vec::new(),
     };
 
-    data.keys().map(|fp| fp.to_string()).collect()
+    data.keys().map(|fp| fp.signature()).collect()
 }