[Waterfall view] Fix the highlight hover board in the row items

[scottykaye]

Problem

In the row items, when you hover over an individual item, the border doesn't apply evenly around the entire item.

Solution

Get the border to fully wrap around a single pixel around the code

[hamlim]

@scottykaye do you have a screenshot showcasing the issue here? Which row items don't get the correct border on hover?

[ballercat]

This is about the Waterfall view. When hovering over a row there should be some highlighting to make it easier to use/read.