The ornamental design for a buttonswitch, as shown and described.
FIG. 1 is a front, top, and right side perspective view showing my new
design for a button switch in full lines, with the broken line matter
being for illustrative purposes only and forming no part of the claimed
design;
FIG. 2 is a left elevational view thereof in full lines, with the broken
line matter being for illustrative purposes only and forming no part of
the claimed design;
FIG. 3 is a rear elevational view thereof in full lines, with the broken
line matter being for illustrative purposes only and forming no part of
the claimed design; and,
FIG. 4 is a bottom plan view thereof in full lines, with the broken line
matter being for illustrative purposes only and forming no part of the
claimed design.