MP/Lobby: flipped blocked players filter

Now it's an inclusion filter (false by default) rather than an inclusion filter.

data/gui/window/lobby_main.cfg

@@ -357,8 +357,8 @@
 
 				[toggle_button]
 					definition = "default"
-					id = "filter_without_ignored"
-					label = _ "Exclude blocked players"
+					id = "filter_with_ignored"
+					label = _ "Include blocked players"
 				[/toggle_button]
 			[/column]
 

src/gui/dialogs/multiplayer/lobby.cpp

@@ -133,7 +133,7 @@ mp_lobby::mp_lobby(mp::lobby_info& info, wesnothd_connection& connection, int& j
 		  preferences::fi_friends_in_game,
 		  preferences::set_fi_friends_in_game,
 		  std::bind(&mp_lobby::game_filter_change_callback, this)))
-	, filter_ignored_(register_bool("filter_without_ignored",
+	, filter_ignored_(register_bool("filter_with_ignored",
 		  true,
 		  preferences::fi_blocked_in_game,
 		  preferences::set_fi_blocked_in_game,
@@ -1103,7 +1103,10 @@ void mp_lobby::game_filter_reload()
 		});
 	}
 
-	if(filter_ignored_->get_widget_value(window)) {
+	// Unlike the friends filter, this is an inclusion filter (do we want to also show
+	// games with blocked players) rather than an exclusion filter (do we want to show
+	// only games with friends).
+	if(filter_ignored_->get_widget_value(window) == false) {
 		lobby_info_.add_game_filter([](const mp::game_info& info)->bool {
 			return info.has_ignored == false;
 		});

src/preferences/lobby.cpp

@@ -69,7 +69,6 @@ void set_fi_friends_in_game(bool value)
 
 bool fi_blocked_in_game()
 {
-	// FIXME: still sorting out defaults and behavior for this...
 	return preferences::get("fi_blocked_in_game", false);
 }