The ornamental design for a floordraingrate, as shown and described.
FIG. 1 is a top perspective view of a floor drain grate embodying our new design;
FIG. 2 is a top view of the floor drain grate seen in FIG. 1;
FIG. 3 is a bottom view of the floor drain grate seen in FIG. 1;
FIG. 4 is a front side view of the floor drain grate seen in FIG. 1, the rear side view, left side view and right side view being mirror images thereof; and,
FIG. 5 is a sectional view of the floor drain grate taken along line 5-5 in FIG. 2.
The broken lines and the areas within them in the figures depict portions of the floor drain grate that form no part of the claimed design. Shade lines in the figures are intended to convey the planes of the floor drain grate.