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do not re-download API Key if already loaded

LorienMan/node-steam-tradeoffers,nseckinoral/node-steam-tradeoffers,Alex7Kom/node-steam-tradeoffers,GoeGaming/node-steam-tradeoffers,lpinca/node-steam-tradeoffers,vejbuch/node-steam-tradeoffers,FelikZ/node-steam-tradeoffer-manager