Make a parsed spacer a value

So a frontend comparing snapshots of the tree sees an unchanged spacer
as unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/ServerTreeSearch.java

@@ -108,7 +108,7 @@ final class ServerTreeSearch implements FindBar.Listener {
             if (!searchChannels) return false;
             Spacers.Spacer spacer = Spacers.parse(ch.name);
             if (spacer == null) return query.matches(ch.name);
-            return spacer.align != '*' && query.matches(spacer.caption);
+            return spacer.align() != '*' && query.matches(spacer.caption());
         }
         return false;
     }