The ornamental design for an icecubetray, as shown and described.
FIG. 1 is a perspective view of an ice cube tray showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a left side elevational thereof.
The surface indicia shown in broken lines on the top surface of the tray is for illustrative purposes only and is hereby disclaimed as forming no part of Applicant's claimed invention.