The ornamental design for a modular extensioncordreel, as shown and described.
FIG. 1 is a rear perspective view of a modular extension cord reel of our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
The dashed broken lines in the drawings are for the purpose of illustrating environment that forms no part of the claimed design. The dash-dot broken lines in the drawings are for the purpose of illustrating boundaries and form no part of the claimed design.