I claim the ornamental design for the 2 roll bath tissue dispenser, as shown and described.
FIG. 1 is a top view of the 2 roll bath tissue dispenser.
FIG. 2 is a bottom view of the claimed design.
FIG. 3 is a side view of the claimed design.
FIG. 4 is a front view of the claimed design; and,
FIG. 5 is a perspective view of the claimed design wherein multiple rolls of bath tissue are depicted in broken lines as environmental matter forming no part of the claimed design.