Added optional valid_until in wallet transfer parameter

[0x00badcoffe]

I had trouble transferring funds to a contract with the error below:

'LITE_SERVER_UNKNOWN: cannot apply external message to current state : External message was not accepted\nCannot run message on account: inbound external message rejected by transaction D236A1DF61696F5B2A6A3CFA5920B97273AF5E741492ED6C4F4292F1129EF941:\nexitcode=36, steps=13, gas_used=0\nVM Log (truncated):\n...CTPUSHCONST 19 (xC_,1)\nexecute DICTIGETJMPZ\nexecute PUSHPOW2 9\nexecute LDSLICEX\nexecute DUP\nexecute LDU 32\nexecute LDU 32\nexecute LDU 32\nexecute XCHG s2\nexecute NOW\nexecute LEQ\nexecute THROWIF 36\ndefault exception handler, terminating vm with exit code 36\n

I noticed that I needed to define a longer validity period for the contract and the transfer wallet function is not possible to define valid_until