Changed brewing recipes

If these are intended changes, that's fine. But filing a bug to be sure.

• Can no longer use Redstone to turn a tier-II potion into an extended potion (or to revert to base if no extended version exists).
• Can no longer use Glowstone to turn an extended potion into a tier-II potion (or to revert to base if no tier-II version exists).
• Can no longer make Potions of Weakness from Mundane or Thick potions.
• Can no longer make Potions of Weakness by adding fermented spider eye to Strength or Regeneration potions.
• Can no longer place splash potions into a brewing stand (but they work fine if they're already in there). (seems to have been resolved as MC-85865)