Stop multiplying duration values
Summary:
After D28144, some animations are now too long because they were inappropriately
multiplying a duration value. That's no longer necessary, so let's remove the
multiplication.
Depends on D28144
Test Plan: Various things that were a bit too slow before feel just right now
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28239