respect log-player-connections flag in config for connection messages (#1503)

proxy/src/main/java/com/velocitypowered/proxy/connection/client/AuthSessionHandler.java

@@ -106,7 +106,9 @@ public class AuthSessionHandler implements MinecraftSessionHandler {
         return CompletableFuture.completedFuture(null);
       }
 
+      if (server.getConfiguration().isLogPlayerConnections()) {
         logger.info("{} has connected", player);
+      }
 
       return server.getEventManager()
           .fire(new PermissionsSetupEvent(player, ConnectedPlayer.DEFAULT_PERMISSIONS))