Fix coding error that caused players to time out if moving to another server fails

Thanks to @Gabik21 for noticing this bug.

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

@@ -430,17 +430,20 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
       }
       KickedFromServerEvent originalEvent = new KickedFromServerEvent(this, rs, kickReason,
           !kickedFromCurrent, result);
-      handleKickEvent(originalEvent, friendlyReason);
+      handleKickEvent(originalEvent, friendlyReason, kickedFromCurrent);
     }
   }
 
-  private void handleKickEvent(KickedFromServerEvent originalEvent, Component friendlyReason) {
+  private void handleKickEvent(KickedFromServerEvent originalEvent, Component friendlyReason,
+      boolean kickedFromCurrent) {
     server.getEventManager().fire(originalEvent)
         .thenAcceptAsync(event -> {
           // There can't be any connection in flight now.
           connectionInFlight = null;
           // Make sure we clear the current connected server as the connection is invalid.
+          if (kickedFromCurrent) {
             connectedServer = null;
+          }
 
           if (event.getResult() instanceof DisconnectPlayer) {
             DisconnectPlayer res = (DisconnectPlayer) event.getResult();