The ornamental design for a screedsupportbracket, as shown and described.
FIG. 1 is a right front perspective view of a screed support bracket, showing our new design;
FIG. 2 is a front elevational view, thereof, the rear elevational view being a mirror image, thereof;
FIG. 3 is an elevational view of one side, the other side elevational view being a mirror image, thereof;
FIG. 4 is a top plan view, thereof;
FIG. 5 is a bottom plan view, thereof; and,
FIG. 6 is a reduced scale perspective view, showing the article mounted over a post and supporting a screed board; the post, the screed boards, the form boards and the concrete shown in broken line are included solely for illustrative purposes, forming no part of the claimed design; the broken lined representation of the second screed support bracket is included solely for illustrative purposes.