Fixed TextureAtlas import wrong images size.

Fix #42057

(cherry picked from commit 395ab3441d68c23d12fd9a2de6740c386b3072aa)

editor/import/resource_importer_texture_atlas.cpp

@@ -128,9 +128,9 @@ static void _plot_triangle(Vector2 *vertices, const Vector2 &p_offset, bool p_tr
 	double xf = x[0];
 	double xt = x[0] + dx_upper; // if y[0] == y[1], special case
 	int max_y = MIN(y[2], height - p_offset.y - 1);
-	for (int yi = y[0]; yi <= max_y; yi++) {
+	for (int yi = y[0]; yi < max_y; yi++) {
 		if (yi >= 0) {
-			for (int xi = (xf > 0 ? int(xf) : 0); xi <= (xt < width ? xt : width - 1); xi++) {
+			for (int xi = (xf > 0 ? int(xf) : 0); xi < (xt < width ? xt : width - 1); xi++) {
 				int px = xi, py = yi;
 				int sx = px, sy = py;
 				sx = CLAMP(sx, 0, src_width - 1);