Fixing an error due to confusingly named check

Refactored healthBarEnabled to healthBarPluginEnabled to avoid this
from happening again.

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -77,7 +77,7 @@ public class mcMMO extends JavaPlugin {
 
     /* Plugin Checks */
     private static boolean combatTagEnabled;
-    private static boolean healthBarEnabled;
+    private static boolean healthBarPluginEnabled;
 
     // Config Validation Check
     public boolean noErrorsInConfigFiles = true;
@@ -118,9 +118,9 @@ public class mcMMO extends JavaPlugin {
             }
 
             combatTagEnabled = getServer().getPluginManager().getPlugin("CombatTag") != null;
-            healthBarEnabled = getServer().getPluginManager().getPlugin("HealthBar") != null;
+            healthBarPluginEnabled = getServer().getPluginManager().getPlugin("HealthBar") != null;
 
-            if (healthBarEnabled) {
+            if (healthBarPluginEnabled) {
                 getLogger().info("HealthBar plugin found, mcMMO's healthbars are automatically disabled.");
             }
 
@@ -266,8 +266,8 @@ public class mcMMO extends JavaPlugin {
         return combatTagEnabled;
     }
 
-    public static boolean isHealthBarEnabled() {
-        return healthBarEnabled;
+    public static boolean isHealthBarPluginEnabled() {
+        return healthBarPluginEnabled;
     }
 
     /**

src/main/java/com/gmail/nossr50/util/MobHealthbarUtils.java

@@ -40,7 +40,7 @@ public final class MobHealthbarUtils {
      * @param damage damage done by the attack triggering this
      */
     public static void handleMobHealthbars(Player player, LivingEntity target, double damage) {
-        if (!mcMMO.isHealthBarEnabled() || !Permissions.mobHealthDisplay(player)) {
+        if (mcMMO.isHealthBarPluginEnabled() || !Permissions.mobHealthDisplay(player)) {
             return;
         }