The ornamental design for a drum table, as shown and described.
FIG. 1 is a perspective view of a drum table showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view, the opposite side being a mirror image thereof; and,
FIG. 4 is a top view thereof.
The views of the drum table not shown form no part of the claimed design. The broken lines depicting ornamentation and feet represent environmental elements only and form no part of the claimed design.