Update height of scrollable small in getFrontsAdPositions.ts (#13815)

The scrollable small has been redesigned. 

The container is now twice the height, the same as scrollable medium.

As such, the height of scrollable small has been moved from 0.5 to 1.

Author: abeddow91

dotcom-rendering/src/lib/getFrontsAdPositions.ts

@@ -185,13 +185,13 @@ const getCollectionHeight = (
 		// Some thrashers are very small. Since we'd prefer to have ads above content rather than thrashers,
 		// err on the side of inserting fewer ads, by setting the number on the small side for thrashers
 		case 'fixed/thrasher':
-		case 'scrollable/small':
 			return 0.5;
 
 		case 'fixed/small/slow-IV':
 		case 'fixed/small/slow-V-mpu':
 		case 'nav/list':
 		case 'nav/media-list':
+		case 'scrollable/small':
 		case 'scrollable/medium':
 		case 'static/medium/4':
 			return 1;