vectorio: fix up Rectangle

* Fix drawing 1 pixel too large
* Need to pad dirty area to ensure removed shapes are fully removed

Author: kvc0

shared-module/vectorio/Rectangle.c

@@ -12,7 +12,7 @@ void common_hal_vectorio_rectangle_construct(vectorio_rectangle_t *self, uint32_
 
 uint32_t common_hal_vectorio_rectangle_get_pixel(void *obj, int16_t x, int16_t y) {
     vectorio_rectangle_t *self = obj;
-    if (x < 0 || x >= self->width || y >= self->height || y < 0) {
+    if (x < 0 || x > self->width || y > self->height || y < 0) {
         return 0;
     }
     return 1;
@@ -21,8 +21,8 @@ uint32_t common_hal_vectorio_rectangle_get_pixel(void *obj, int16_t x, int16_t y
 
 void common_hal_vectorio_rectangle_get_area(void *rectangle, displayio_area_t *out_area) {
     vectorio_rectangle_t *self = rectangle;
-    out_area->x1 = 0;
-    out_area->y1 = 0;
+    out_area->x1 = -1;
+    out_area->y1 = -1;
     out_area->x2 = self->width;
     out_area->y2 = self->height;
 }