fix(Core/Spells): several improvements to cooldowns (#7559)

- Reworked spell category cooldowns.
- Implemented category cooldowns for pets.
- Properly shows pet spell cooldowns in player's UI.
- Corrected pet spell cooldowns with infinity duration.
- Do not add/remove infinity spell cooldown on aura apply/remove if casted by item.
- Closes #5263

src/server/game/Entities/Player/PlayerUpdates.cpp

@@ -1489,8 +1489,8 @@ void Player::UpdatePotionCooldown(Spell* spell)
     {
         if (spell->IsIgnoringCooldowns())
             return;
-        else
-            SendCooldownEvent(spell->m_spellInfo, m_lastPotionId, spell);
+
+        SendCooldownEvent(spell->m_spellInfo, m_lastPotionId, spell);
     }
 
     SetLastPotionId(0);