The ornamental design for a concrete formclip, as shown and described.
FIG. 1 is a top front left perspective view of a concrete form clip in accordance with my new design;
FIG. 2 is a bottom front left perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof; and,
FIG. 7 is a left elevation view thereof.
The broken lines shown in FIGS. 1-7 illustrate portions of the concrete form clip that form no part of the claimed design. The dash-dot lines shown in FIGS. 1-4 and FIG. 7 illustrate a boundary line that forms no part of the claimed design.