Summary:
The W3C CSS validator throws `Value Error : overflow normal is not a overflow value : normal`.
`normal` is not a valid value for `overflow`, as browsers currently cannot parse it they fall back to the default `visible`, thus change it to `visible`.
See https://developer.mozilla.org/en-US/docs/Web/CSS/overflow
Test Plan:
Paste `phui-oi-list-view.css` into https://jigsaw.w3.org/css-validator/ and read some CSS docs.
Also, visit a page showing a PHUIObjectItemView, like the /phame/post/ page, and
have a object with a veeeeeery long name, and see absolutely no difference A/B,
both on desktop, medium and small screens.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25921
06a62b347a