wallet API: remove get_request_status, it is redundant with get_invoice_status
wallet API: remove get_request_status, it is redundant with get_invoice_status

spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,pooler/electrum-ltc,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum