We claim the ornamental design for a mobile single-door food cabinet, as shown and described.
FIG. 1 is a perspective view of a mobile single-door food cabinet showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom perspective view thereof.
Broken lines in the drawings are for the purpose of illustrating presently unclaimed portions of a mobile single-door food cabinet and form no part of the claimed design.