Things are heating up in “The Voice Teens” on ABS-CBN. The battle rounds premiered Sunday, June 4. Coaches Sharon Cuneta, Lea Salonga, Sarah Geronimo and Bamboo each has 12 artists hoping to go through to the next level of the singing competition. Team Bamboo wins best moment this weekend. Here’s why. Seventeen-year-old Fritzy Eluna, from Bacolod, and 15-year-old Bea Muñoz …