renamed less variable

[szydan]

Just a small PR to rename less variable according the TODO found in the code

// TODO: Rename `@input-border-radius` to `@input-border-radius-base` in v4

[elasticmachine]

Can one of the admins verify this patch?

[thomasneirynck]

Looks fine to me, but I don't have to clear a view how consistent we are in naming less-vars to begin with. @cjcenizal @bevacqua, could one of you take a look as well?

Nice to see a todo disappear though! Musing here, but ideally, we'd track outstanding tasks in github iso. the code...

[bevacqua]

Probably should be @cjcenizal who reviews, I'm not sure what his reasoning was for the TODO item.

[cjcenizal]

This comment was written by the Bootstrap dev team, and got carried over when we copy/pasted the source, so technically it doesn't pertain to Kibana. That being said, this is now technically our code, not Bootstrap's, and changes like these are exactly the reason we removed the Bootstrap dependency.

It looks like all the references were caught, and there's a very minimal risk this breaks anything. So, I say, let's merge it!

Thanks for your contribution, @szydan! LGTM.

[cjcenizal]

@bevacqua Your thoughts?

[bevacqua]

LGTM