Fixed todo for smooth scrolling in the tasklist

[Stefan Berzl]

Sorry, the patch was missing a line.
Here's the final version.

On 17/08/17 02:12, Stefan Berzl wrote:
> Hello everyone,
> 
> there was a TODO on how to react when scrolling on the tasklist and your 
> mouse had smooth scrolling (GDK_SCROLL_SMOOTH). I liked the feature of 
> being able to scroll through open windows to here's a patch for it.
> 
> Bye bye
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