The ornamental design for a rollershadebracket, as substantially shown and described.
FIG. 1 is a front perspective view of a roller shade bracket showing my new design, the dotted lines depicting environmental subject matter only and forming no part of the claimed design.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a is a top plan elevation view thereof; and,