The ornamental design for a wallboard trim for fluteddeck ceiling, as shown and described.
FIG. 1 is a front elevation view of a wallboard trim for fluted deck ceiling showing the claimed design, wherein the break lines indicate intermediate length;
FIG. 2 is a top elevation view thereof, wherein the break lines indicate intermediate length;
FIG. 3 is a bottom elevation view thereof, wherein the break lines indicate intermediate length;
FIG. 4 is a side elevation view thereof;
FIG. 5 is a rear elevation view thereof; and,
FIG. 6 is a front perspective view of the wallboard trim device of FIG. 1 shown in use, wherein the break lines indicate intermediate length and the broken lines represent the environment in which the design resides and forms no part of the claim.