PicoVector: Fix bug in Polygon.rectangle.

Fix spurious point in top-left corner causing a broken triangular
rectangle when any permutation of corners other than the bottom-left
is rounded.

libraries/pico_vector/pretty-poly-primitives.h

@@ -115,7 +115,7 @@ void _ppp_rrect_path(pp_path_t *path, ppp_rect_def d) {
   d.r1 == 0 ? pp_path_add_point(path, (pp_point_t){d.x, d.y})             : _ppp_rrect_corner(path, d.x + d.r1, d.y + d.r1, d.r1, 3);
   d.r2 == 0 ? pp_path_add_point(path, (pp_point_t){d.x + d.w, d.y})       : _ppp_rrect_corner(path, d.x + d.w - d.r2, d.y + d.r2, d.r2, 2);
   d.r3 == 0 ? pp_path_add_point(path, (pp_point_t){d.x + d.w, d.y + d.h}) : _ppp_rrect_corner(path, d.x + d.w - d.r3, d.y + d.h - d.r3, d.r3, 1);
-  d.r4 == 0 ? pp_path_add_point(path, (pp_point_t){d.x, d.y})             : _ppp_rrect_corner(path, d.x + d.r4, d.y + d.h - d.r4, d.r4, 0);
+  d.r4 == 0 ? pp_path_add_point(path, (pp_point_t){d.x, d.y + d.h})       : _ppp_rrect_corner(path, d.x + d.r4, d.y + d.h - d.r4, d.r4, 0);
 }
 
 pp_poly_t* ppp_rect(ppp_rect_def d) {