By Dhanya Skariachan Feb 13 (Reuters) - Toys R Us Inc said on Wednesday that Gerald Storch will step down as its chief executive, just weeks after the world's largest dedicated toy retailer reported lackluster results for the all-important holiday season. Storch, 56, will remain chairman of the board. The stakes were high for Toys R Us this season as it has yet to return to being a public company after filing for an initial public offering in May 2010. The company, which saw it