The ornamental design for a projectorholder, as shown and described.
FIG. 1 is a perspective view of a projector holder showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom perspective view.
The broken lines immediately adjacent to the shaded areas in the views represent the boundaries of the design. The broken lines represent portions of the design that form no part of the claim. None of the broken lines form any part of the claimed design.