I claim the ornamental design for a combined cover plate with nightlight, as shown and described.
FIG. 1 is a left front perspective view of a combined cover plate with nightlight showing my new design;
FIG. 2 is a right rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right-side elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a left-side elevational view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top plan view thereof.
The broken lines of FIGS. 2 and 5 are for the purpose of defining the bounds of the claim and form no part of the claimed design. The broken lines of FIGS. 1 and 3 depict portions of the combined cover plate with nightlight that form no part of the claimed design.