Fix issue were glow was not removed.

If glow was applied to a panel item, but then the glow setting was set
to false, the glow was not removed from the panel item.

Relates to BentoBoxWorld/AOneBlock#326

src/main/java/world/bentobox/bentobox/api/panels/PanelItem.java

@@ -130,8 +130,13 @@ public boolean isGlow() {
     public void setGlow(boolean glow) {
         this.glow = glow;
         if (meta != null) {
-            meta.addEnchant(Enchantment.ARROW_DAMAGE, 0, glow);
+            if (glow) {
+                meta.addEnchant(Enchantment.ARROW_DAMAGE, 0, glow);
+            } else {
+                meta.removeEnchant(Enchantment.ARROW_DAMAGE);
+            }
             icon.setItemMeta(meta);
+
         }
     }