Fix ships leaving dots behind in viewport map mode

Fixes: 57db9a41

src/ship_cmd.cpp

@@ -397,11 +397,10 @@ bool RecentreShipSpriteBounds(Vehicle *v)
 	Ship *ship = Ship::From(v);
 	if (ship->rotation != ship->cur_image_valid_dir) {
 		ship->cur_image_valid_dir  = INVALID_DIR;
-		Point offset = RemapCoords(ship->x_offs, ship->y_offs, 0);
-		ship->sprite_seq_bounds.left = -offset.x - 16;
-		ship->sprite_seq_bounds.right = ship->sprite_seq_bounds.left + 32;
-		ship->sprite_seq_bounds.top = -offset.y - 16;
-		ship->sprite_seq_bounds.bottom = ship->sprite_seq_bounds.top + 32;
+		ship->sprite_seq_bounds.left = -16;
+		ship->sprite_seq_bounds.right = 16;
+		ship->sprite_seq_bounds.top = -16;
+		ship->sprite_seq_bounds.bottom = 16;
 		return true;
 	}
 	return false;

src/vehicle.cpp

@@ -2064,7 +2064,7 @@ void ViewportMapDrawVehicles(DrawPixelInfo *dpi, Viewport *vp)
 
 					while (v != nullptr) {
 						if (!(v->vehstatus & (VS_HIDDEN | VS_UNCLICKABLE)) && (v->type != VEH_EFFECT)) {
-							Point pt = RemapCoords(v->x_pos + v->x_offs, v->y_pos + v->y_offs, v->z_pos);
+							Point pt = { v->coord.left, v->coord.top };
 							if (pt.x >= l && pt.x < r && pt.y >= t && pt.y < b) {
 								const int pixel_x = UnScaleByZoomLower(pt.x - l, dpi->zoom);
 								const int pixel_y = UnScaleByZoomLower(pt.y - t, dpi->zoom);