By Marijke RowlandAnd then there were two Dolls.After nearly 20 years as a trio, the Goo Goo Dolls have become a duo with founding members John Rzeznik and Robby Takac carrying on the band’s musical legacy. Earlier this spring they released their 11th studio album, “Boxes,” which band bassist Takac said finds the musicians breaking out of their own metaphorical boxes.That means working with other producers and writers, both past collaborators and new partners. It was a trend that started with the group’s last album, 2012’s “Magnetic,” which still featured its longtime drummer Mike Malinin. The