Cut some notification samples to remove echo on the end

[unststable]

This is pretty simple change to the notification-cancel, notification-done and notification-error sounds, cutted it on the end for echo removal.

2025-12-12.15-11-24.mp4

[peppy]

why?

[unststable]

why?

it sounds a bit better imo
plus if you compare with notification-default, there is no echo

[peppy]

@nekodex can you double check and action on this one (merge or close either is fine).

[nekodex]

Thanks for bringing this up, however simply truncating the samples cuts the reverb prematurely.

I've gone and done a quick fix+enhance pass on the affected samples here, which gets rid of the stray delay/echo.