Fix entity camera not being reset when cancelling spectating start/stop events (#9883)

patches/server/Call-player-spectator-target-events-and-improve-impl.patch

@@ -30,11 +30,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +            if (this.camera == this) {
 +                com.destroystokyo.paper.event.player.PlayerStopSpectatingEntityEvent playerStopSpectatingEntityEvent = new com.destroystokyo.paper.event.player.PlayerStopSpectatingEntityEvent(this.getBukkitEntity(), entity1.getBukkitEntity());
 +                if (!playerStopSpectatingEntityEvent.callEvent()) {
++                    this.camera = entity1; // rollback camera entity again
 +                    return;
 +                }
 +            } else {
 +                com.destroystokyo.paper.event.player.PlayerStartSpectatingEntityEvent playerStartSpectatingEntityEvent = new com.destroystokyo.paper.event.player.PlayerStartSpectatingEntityEvent(this.getBukkitEntity(), entity1.getBukkitEntity(), entity.getBukkitEntity());
 +                if (!playerStartSpectatingEntityEvent.callEvent()) {
++                    this.camera = entity1; // rollback camera entity again
 +                    return;
 +                }
 +            }
@@ -42,11 +44,3 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
              Level world = this.camera.level();
  
              if (world instanceof ServerLevel) {
-@@ -0,0 +0,0 @@ public class ServerPlayer extends Player {
-             this.connection.send(new ClientboundSetCameraPacket(this.camera));
-             this.connection.resetPosition();
-         }
--
-     }
- 
-     @Override