The ornamental design for a projector, as shown and described.
FIG. 1 is a perspective view of a projector showing our new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is another perspective view thereof in a tilted state; and,
FIG. 10 is another perspective view thereof in a close state.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken ones are directed to environment and are for illustrative purposes only; the broken ones form no part of the claimed design.