The ornamental design for a powerplugcover, as shown and described.
FIG. 1 is a rear perspective view of a power plug cover showing my new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top plan view thereof.
The fragmentary broken-line disclosure of plug and power cord in FIG. 1 represent unclaimed subject matter provided for illustrative purposes only and which form no part of the claimed design.