I claim the ornamental design for a solar roof tile, as shown and described.
FIG. 1 is a top-front-right perspective view of a solar roof tile;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown represent environmental subject matter and form no part of the claimed design.
The solar roof tile is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.