The ornamental design for a foldable motorized scooter, as shown and described.
FIG. 1 is a left side elevation view of a foldable motorized scooter, showing my new design, the right side elevation view being a mirror image thereof;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear elevation view thereof; and,
FIG. 5 is a left side elevation view like FIG. 1 but showing the foldable motorized scooter in a folded position.