I claim an ornamental design for a deadbolt button, as shown and described.
FIG. 1 is a perspective view of a button of the new design;
FIG. 2 is a front side view of the button of FIG. 1;
FIG. 3 is a rear side view of the button of FIG. 1;
FIG. 4 is a top view of the button of FIG. 1;
FIG. 5 is a bottom view of the button of FIG. 1;
FIG. 6 is a left side view of the button of FIG. 1; and,
FIG. 7 is a right side view of the button of FIG. 1.
The portions of the Figures shown in phantom lines, or any text, graphic direction arrows or axis symbols included in the Figures, are not part of the claimed design but are shown for illustration only.