[Black Mage] Please re-implement the shared action options from the Media Tour

[Pyitoechito]

During the media tour for black mage, certain element-exclusive spells had shared action slots (swapping based on Astral Fire/Umbral Ice). These were:

• Fire IV and Blizzard IV
• Flare and Freeze
• Despair and Umbral Soul

Which I personally thought was an amazing change, especially as a controller player that likes any form of action consolidation and since those spells are only ever available in their respective AF/UI state. However, in the live game these changes weren't implemented, which feels like a big bamboozle. Please, SE, re-implement the black mage shared spells as an option! I really need to emphasize making it an option so players can freely choose if they want to share the slots or not.