The ornamental design for a horsesaddle, as shown and described.
FIG. 1 is a perspective view of the present invention shown in position of use; and
FIG. 2 is a front view of the present invention; and
FIG. 3 is a rear view of the present invention; and
FIG. 4 is a right side view of the present invention; and
FIG. 5 is a left side view of the present invention; and,
FIG. 6 is a top view of the present invention.
The broken lines showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design.