The ornamental design for a wiresignholder, as shown and described.
FIG. 1 is a top perspective view of a wire sign holder of the present invention;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a front side elevational view thereof;
FIG. 6 is a back side elevational view thereof; and,
FIG. 7 is right side elevational view thereof.
The long and short broken lines shown in the drawings are directed to environment, are for informational purposes only and form no part of the claimed design.