The ornamental design for a magneticzipper, as shown and described.
FIG. 1 is a side view showing our design;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is an opposite side view of FIG. 1;
FIG. 4 is a top view of FIG. 2;
FIG. 5 is a bottom view of FIG. 2; and,
FIG. 6 is an enlarged view of the area demarcated in FIG. 5.
The dot-dot-dash broken lines shown in FIGS. 5 and 6 demarcate the enlarged view shown in FIG. 6 and form no part of the claimed design. The broken line portion of FIGS. 1, 2, 3, 4 and 5 is included to show environment that forms no part of the claimed design.