Change nick command to use remainter param

sources/Commands/ACommandNick.uc

@@ -36,7 +36,7 @@ protected function BuildData(CommandDataBuilder builder)
 {
     builder.Name(P("nick")).Summary(P("Changes nickname."));
     builder.RequireTarget();
-    builder.ParamText(P("nick"))
+    builder.ParamRemainder(P("nick"))
         .Describe(P("Changes nickname of targeted players to <nick>."));
     builder.Option(P("plain"))
         .Describe(P("Take nickname exactly as typed, without attempting to"