backup: remote: Trivial whitespace fix

I messed up formatting during conflict resolution across rebasing
while preparing my checkpoint patches :)
Signed-off-by: NEric Blake <eblake@redhat.com>

src/remote/remote_protocol.x

@@ -6538,7 +6538,7 @@ enum remote_procedure {
      */
     REMOTE_PROC_NETWORK_PORT_DELETE = 410,
 
-   /**
+    /**
      * @generate: both
      * @acl: domain:checkpoint
      * @acl: domain:fs_freeze:VIR_DOMAIN_CHECKPOINT_CREATE_QUIESCE