Combination of flex-direction & height breaks measure function

## `taffy` version

0.3.0 alpha 1 (current main)

## Platform

Rust

## What you did

```html
<div id="test-root" style="display: flex; flex-direction: column; width: 100px; height: 100px;">
<div>HHHHHHH&ZeroWidthSpace;HHHHHH&ZeroWidthSpace;HHHH&ZeroWidthSpace;HHHHHH&ZeroWidthSpace;HHHH&ZeroWidthSpace;HHHHHHH</div>
</div>
```

## What went wrong

Test doesn't pass