The ornamental design for ladder bootie, as shown and described.
FIG. 1 is a left-side elevational view of the invention, illustrating a ladder bootie of the design and a ladder leg in phantom outline, the broken lines showing the ladder leg for illustrative purposes only and forming no part of the claimed design, the right-side elevational view being a mirror image thereof;
FIG. 2 is a perspective view of the invention;
FIG. 3 is a top plan view of the invention;
FIG. 4 is a bottom plan view of the invention;
FIG. 5 is a rear elevational view of the invention; and,
FIG. 6 is a front elevational view of the invention.