BERLIN — Omar Marmoush continued his prolific form with two more goals as second-place Eintracht Frankfurt won 4-0 at Heidenheim on Sunday to move four points behind Bundesliga leader Bayern Munich. The Egypt striker pounced midway through the first half when he latched onto Nathaniel Brown’s pass and hit a first-time shot past goalkeeper Kevin Müller. After substitute Farès Chaïbi …