Replaced reference method with qualifier (websockets)

src/main/java/org/qortal/api/websocket/AdminStatusWebSocket.java

@@ -31,7 +31,7 @@ public class AdminStatusWebSocket extends ApiWebSocket implements Listener {
 			return;
 		}
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override

src/main/java/org/qortal/api/websocket/BlocksWebSocket.java

@@ -28,7 +28,7 @@ public class BlocksWebSocket extends ApiWebSocket implements Listener {
 	public void configure(WebSocketServletFactory factory) {
 		factory.register(BlocksWebSocket.class);
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override

src/main/java/org/qortal/api/websocket/PresenceWebSocket.java

@@ -86,7 +86,7 @@ public class PresenceWebSocket extends ApiWebSocket implements Listener {
 			return;
 		}
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override

src/main/java/org/qortal/api/websocket/TradeBotWebSocket.java

@@ -43,7 +43,7 @@ public class TradeBotWebSocket extends ApiWebSocket implements Listener {
 			// No output this time
 		}
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override

src/main/java/org/qortal/api/websocket/TradeOffersWebSocket.java

@@ -67,7 +67,7 @@ public class TradeOffersWebSocket extends ApiWebSocket implements Listener {
 			return;
 		}
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override

src/main/java/org/qortal/api/websocket/TradePresenceWebSocket.java

@@ -29,7 +29,7 @@ public class TradePresenceWebSocket extends ApiWebSocket implements Listener {
 
 		populateCurrentInfo();
 
-		EventBus.INSTANCE.addListener(this::listen);
+		EventBus.INSTANCE.addListener(this);
 	}
 
 	@Override