Core/Spells: Fix potions exploit

Fix an exploit that allowed to consume different potions even if they share the same cooldown.
Closes #15265

src/server/game/Globals/ObjectMgr.cpp

@@ -2754,6 +2754,14 @@ void ObjectMgr::LoadItemTemplates()
                         TC_LOG_ERROR("sql.sql", "Item (Entry: %u) has broken spell in spellid_%d (%d)", entry, j+1, itemTemplate.Spells[j].SpellId);
                         itemTemplate.Spells[j].SpellId = 0;
                     }
+
+                    if (spellInfo && itemTemplate.Spells[j].SpellCategory)
+                    {
+                        bool added = sSpellsByCategoryStore[itemTemplate.Spells[j].SpellCategory].insert(itemTemplate.Spells[j].SpellId).second;
+                        if (added)
+                            TC_LOG_DEBUG("sql.sql", "Item(Entry: %u) spellid_%d (%d) category %u added to sSpellsByCategoryStore",
+                                          entry, j + 1, itemTemplate.Spells[j].SpellId, itemTemplate.Spells[j].SpellCategory);
+                    }
                 }
             }
         }