The ornamental design for a tubfaucet, as shown and described.
FIG. 1 is a front perspective view of a tub faucet showing my design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view; the right side elevational view being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line showing a spout opening is included for the purpose of illustrating a portion of the tub faucet that forms no part of the claimed design.