The ornamental design for a haircut fade guide, as shown and described.
FIG. 1 is a front perspective view of a haircut fade guide, showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left-side elevational view thereof;
FIG. 6 is a right-side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in FIG. 1 depciting a person depict enviornmental matter that forms no part of the claimed design. The remaining broken lines in the figures depict portions of the haircut fade guide that form no part of the claimed design. The word mark Fade Guide shown in the drawings is a trademark of Fade Guide LLC.