Function updateRoyaltyTier

updateRoyaltyTier(program: GalacticMarketplaceIDLProgram, updateAuthorityAccount: AsyncSigner<unknown>, registeredCurrency: {
registeredCurrency: RegisteredCurrency;
} | {
key: PublicKey;
}, stakeAmount: number, discount: number): InstructionReturn
Update the discount rate associated with a given royalty tier if it exists

Returns
InstructionReturn
Parameters
- program: GalacticMarketplaceIDLProgram
  
  GalacticMarketplace Program
- updateAuthorityAccount: AsyncSigner<unknown>
  
  the authority of the market
- registeredCurrency: {
  registeredCurrency: RegisteredCurrency;
  } | {
  key: PublicKey;
  }
  
  a valid registered currency
- stakeAmount: number
  
  the staked amount in the token's base units
- discount: number
  
  the new discount amount (Discount of '1_000_000' == 100%)
Returns InstructionReturn