The ornamental design for the display panel-mounting bracket, as shown and described.
FIG. 1 is a perspective view of a display panel-mounting bracket.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a right side view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the display panel-mounting bracket as a component of a device for mounting a display panel on a wall, wherein the other illustrated components of the device represent environmental structure and form no part of the claimed design.
The broken lines shown in FIG. 8 are directed to features of the design not claimed.