The ornamental design for a liquiddispenser, as shown and described above.
FIG. 1 is a perspective view of the liquid dispenser;
FIG. 2 is a left side elevation view of the liquid dispenser of FIG. 1,
FIG. 3 is a right side elevation view of the liquid dispenser of FIG. 1;
FIG. 4 is a front elevation view of the liquid dispenser of FIG. 1;
FIG. 5 is a bottom plan view of the liquid dispenser of FIG. 1;
FIG. 6 is a top elevation view of the liquid dispenser of FIG. 1; and,
FIG. 7 is a rear elevation view of the liquid dispenser of FIG. 1.
The broken line disclosure is understood to represent a portion of the article in which the claimed design is embodied, but which forms no part of the claimed design.