Tweak logic for determining if a player is dead, fix issues with <1HP players being detected dead

bukkit/src/main/java/net/william278/husksync/player/BukkitPlayer.java

@@ -618,7 +618,7 @@ public class BukkitPlayer extends OnlineUser {
 
     @Override
     public boolean isDead() {
-        return player.isDead() || player.getHealth() <= 0;
+        return player.getHealth() <= 0;
     }
 
     @Override

common/src/main/java/net/william278/husksync/player/OnlineUser.java

@@ -321,6 +321,7 @@ public abstract class OnlineUser extends User {
                         if (!isOffline()) {
                             if (settings.getSynchronizationFeature(Settings.SynchronizationFeature.INVENTORIES)) {
                                 if (isDead() && settings.saveDeadPlayerInventories) {
+                                    logger.debug("Player " + username + " is dead, so their inventory will be set to empty.");
                                     add(CompletableFuture.runAsync(() -> builder.setInventory(ItemData.empty())));
                                 } else {
                                     add(getInventory().thenAccept(builder::setInventory));