Admin common style selectors must be more specific

[geminorum]

Apparently BuddyPress adds common styles to all admin pages, and appends a buddypress class to the html body. for example:

.buddypress code {
    background-color: #e0e0e0;
    color: #636363;
    font-size: 1em;
}

it affects all code tags on all admin page, and frankly not a good practice.

[DJPaul]

We add some common wp-admin styles across, yes, because we set some CSS for menu icons and to modify parts of the users list table (if I remember correctly).

I agree this style is too general. It was probably added innocently to help style the Credits page, so I'm going to #yolo tweak the selector for now as a quick fix.

[DJPaul]

My guess was right, see r11425

[djpaul]

In 11672:

Admin: make some CSS in common admin styles specific to BP screens.

Fixes #7575

Props geminorum