Increase width of menu item classes field

[lkraav]

Relatively self-explanatory patch attached.

Let me know if more details needed.

[lkraav]

I should've added the patch commit message to description to increase visibility. Unfortunately not enough privileges to edit description, so here goes:

DESCRIPTION

Menu item CSS class editor field is super narrow, for no obvious reason. For
any class attribute list longer than a single element, this .description-thin
control is just plain uncomfortable to use.

.description-wide expands the field to 100% width and all is good.

[swissspidy]

Menu item CSS class editor field is super narrow, for no obvious reason.

The obvious reason is that the CSS classes and XFN fields are displayed side by side:

With the current patch, it looks like this:

In the customizer:

[lkraav]

Good find, now I know why. Thanks for taking the time for the screenshots. I don't think I've ever had use for the Link Relationship field and didn't have it enabled.

I would argue that the patch works out just fine regardless. Depending on what the purpose of the Link Rel field is, perhaps it could be brought along for the ride?