fix(transformer-variant-group): breakpoint alias

[enkot]

Fixes #2582

Not sure if there are caveats to this solution, but it solves the problem.

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[zyyv]

In order to distinguish the variants of windi and retain the style of UnoCSS, we use the lt- variant as a replacement.
There are many more, such as using _ to distinguish from windicss - ...

[enkot]

@zyyv @antfu But aliases are supported in Unocss - #2266, isn't it?

[zyyv]

Sorry, I overlooked the change #2266.
A long time ago, someone sent a similar PR change, and it was closed in order to maintain a unique style.

I will set it back to open, keep it active.

[enkot]

@zyyv Thanks!