The ornamental design for a paperrollholder, as shown and described.
FIG. 1 is a front elevational view of a paper roll holder according to my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is a rear elevational view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken-line disclosure is understood to represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design.