Remove unnecessary reduce motion when $enable-transition: false

[ysds]

When $enable-transition: false,

@media (prefers-reduced-motion: reduce) {
   transition: none;
}

is unnecessary.

[XhmikosR]

@ysds don't forget to add the projects in the PRs :)

[XhmikosR]

If this is supposed to be backported to v4, we need the 4.4.2 project too.

[XhmikosR]

Any reason why not include this in alpha-1 and 4.4.2 subsequently?

[ysds]

I think this a minor bug. To speed up the release of Alpha1, I targeted this to Alpha2 not to increase our review work, but now the review was completed it is fine to include this in Alpha1.

I forgot to put it in 4.4.2 ^^;