hotfix flag autocomplete

BauSystem_Main/src/de/steamwar/bausystem/features/tracer/TraceCommand.java

@@ -268,7 +268,7 @@ public class TraceCommand extends SWCommand {
             @Override
             public Collection<String> tabCompletes(CommandSender sender, PreviousArguments previousArguments, String s) {
                 return ViewFlag.flags.stream()
-                        .flatMap(viewFlag -> Stream.concat(Stream.of("--" + viewFlag.name),
+                        .flatMap(viewFlag -> Stream.concat(Stream.of("-" + viewFlag.name),
                                 Arrays.stream(viewFlag.aliases).map(name -> "-" + name)))
                         .collect(Collectors.toList());
             }