(Reuters) - European shares were steady on Thursday after hitting a six-week high earlier in the session on further signs of detente between the United States and China over trade.Focus was on the European Central Bank's monetary policy decision due at 1145 GMT, with investors widely expecting another round of stimulus to prop up an ailing euro zone economy.The pan-European stock index was flat at 0830 GMT after rising to a six-week high in early trading.That rally was led by commodity-linked..