The ornamental design for a toiletseatlifter, as shown and described.
FIG. 1 is a side view of the toilet seat lifter showing my new design in a first position. The broken line showing of the toilet is for the purpose of illustrating environmental structure and forms no part of the claimed design;
FIG. 2 is a side view thereof particularly showing the toilet seat lifter in a second position. The broken line showing of the toilet is for the purpose of illustrating environmental structure and forms no part of the claimed design;
FIG. 3 is an enlarged, side view of the toilet seat lifter as shown in FIG. 1; and,
FIG. 4 is a front view of the toilet seat lifter as shown in FIG. 3.