ISTANBUL/DUSSELDORF (Reuters) - German consumer electronics retailer MediaMarkt has suspended plans to buy shares in Turkey's Teknosa , two sources close to the matter said, after recent falls in the lira hit profits of Turkish firms.Shares in Teknosa tumbled 17.6 percent to 3.84 lira on the news, while the main share index was 0.58 percent lower.One source said MediaMarkt was reviewing its valuation of the Teknosa stake following the lira's slide to record lows, which dampened demand for..