Fix issue when Challenge and ChallengeLevel icons were stored with glowing effect and lore from admin panel.

This issue happened because PanelItem overwrites ItemStack metaData.
It is fixed by returning clone of icon element instead of returning actual icon.

src/main/java/world/bentobox/challenges/database/object/Challenge.java

@@ -308,7 +308,7 @@ public class Challenge implements DataObject
      */
     public ItemStack getIcon()
     {
-        return icon;
+        return icon.clone();
     }
 
 

src/main/java/world/bentobox/challenges/database/object/ChallengeLevel.java

@@ -138,7 +138,7 @@ public class ChallengeLevel implements DataObject, Comparable<ChallengeLevel>
      */
     public ItemStack getIcon()
     {
-        return icon;
+        return icon.clone();
     }