The ornamental design for a projectorholder, as shown and described.
FIG. 1 is a top, front, right side perspective view of a projector holder showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The dot-dash broken lines in the figures represent boundaries of the claimed design and form no part thereof. All other broken lines illustrate portions of the projector holder that form no part of the claimed design.