The ornamental design for a cutting mattemplate, as shown and described.
FIG. 1 is a perspective view of a cutting mat template showing our new design.
FIG. 2 is a top plan view as shown in FIG. 1.
FIG. 3 is a left side elevational view as shown in FIG. 1.
FIG. 4 is a right side elevational view as shown in FIG. 1.
FIG. 5 is a front elevational view as shown in FIG. 1; and,
FIG. 6 is a back elevational view as shown in FIG. 1.
The broken lines in the figures are included for the purpose of illustrating environmental subject matter and form no part of the claimed design. The article is shown with a symbolic break in length. The appearance of any portion of the article between the break lines forms no part of the claimed design.