The ornamental design for a platformshuttle, as shown and described.
FIG. 1 is a top plan view of the platform shuttle;
FIG. 2 is a right side elevational view of the platform shuttle;
FIG. 3 is a left side elevational view of the platform shuttle;
FIG. 4 is an enlarged front elevational view of the platform shuttle;
FIG. 5 is an enlarged rear elevational view of the platform shuttle;
FIG. 6 is a top plan view of the platform shuttle;
FIG. 7 is an upper perspective view of the platform shuttle; and,
FIG. 8 is a lower perspective view of the platform shuttle.
The broken line showing in the figures is included for the purpose of illustrating portions of the platform shuttle and forms no part of the claimed design.