api: datastore: require allocate privilege for deletion

makes only sense if we allow addition of a datastore also just with
that privilege

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/api2/config/datastore.rs

@@ -375,7 +375,7 @@ pub fn update_datastore(
         },
     },
     access: {
-        permission: &Permission::Privilege(&["datastore", "{name}"], PRIV_DATASTORE_MODIFY, false),
+        permission: &Permission::Privilege(&["datastore", "{name}"], PRIV_DATASTORE_ALLOCATE, false),
     },
 )]
 /// Remove a datastore configuration.