The ornamental design for a projector, as shown and described.
FIG. 1 is a top left perspective view of a projector showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken lines illustrate portions of the projector and form no part of the claimed design.
The dotted-dashed lines illustrate only the boundaries between the part for which design registration is sought as a partial design and the other part.