Revert "Make animation durations consistent with Kirigami values"

This reverts commit 049978008b1268a1f46bde99ad260002fee7fd56.

This commit changes existing animation durations, and must be landed
simultaneously with Plasma 5.19's release so that rolling release
users don't suffer from very slow animations for a month. Will
re-land after Plasma 5.59 is tagged so it gets released with Frameworks
5.60, the dependency version for Plasma 5.19.