Handle candy machine program errors better

[kunalmodi]

When minting an NFT with insufficient balance, I get the following error:

Transaction simulation failed: Error processing Instruction 4: custom program error: 0x1778 
    Program 11111111111111111111111111111111 invoke [1]
    Program 11111111111111111111111111111111 success
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA invoke [1]
    Program log: Instruction: InitializeMint
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA consumed 2457 of 200000 compute units
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA success
    Program ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL invoke [1]
    Program log: Transfer 2039280 lamports to the associated token account
    Program 11111111111111111111111111111111 invoke [2]
    Program 11111111111111111111111111111111 success
    Program log: Allocate space for the associated token account
    Program 11111111111111111111111111111111 invoke [2]
    Program 11111111111111111111111111111111 success
    Program log: Assign the associated token account to the SPL Token program
    Program 11111111111111111111111111111111 invoke [2]
    Program 11111111111111111111111111111111 success
    Program log: Initialize the associated token account
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA invoke [2]
    Program log: Instruction: InitializeAccount
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA consumed 3297 of 174518 compute units
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA success
    Program ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL consumed 29428 of 200000 compute units
    Program ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL success
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA invoke [1]
    Program log: Instruction: MintTo
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA consumed 2611 of 200000 compute units
    Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA success
    Program cndy3Z4yapfJBmL3ShUp5exZKqR3z33thTzeNMm2gRZ invoke [1]
    Program log: Instruction: MintNft
    Program log: recent_blockhashes is deprecated and will break soon
    Program log: Custom program error: 0x1778
    Program cndy3Z4yapfJBmL3ShUp5exZKqR3z33thTzeNMm2gRZ consumed 36701 of 200000 compute units
    Program cndy3Z4yapfJBmL3ShUp5exZKqR3z33thTzeNMm2gRZ failed: custom program error: 0x1778

This is the list of Candy Machine error codes: https://github.com/metaplex-foundation/metaplex-program-library/blob/master/candy-machine/program/src/lib.rs#L1043. Ideally we could return the right error code for clients to handle

[kunalmodi]

Fixed in e11c658