switch statements should be formatted consistently

[wonderboymusic]

I have been looking at a number of issues over at #27882.

There are a variety of places in core that format switch statements differently. IMO, default should always be at the bottom. It's more consistent, and it doesn't confuse static analysis tools (we don't have to do everything that is suggested by automated tools).

switch ( $var ) {
    case 1:
        $return = 'match';
        break;
    default:
        break;
}

is better than:

switch ( $var ) {
    default:
        break;
    case 1:
        $return = 'match';
        break;
}

[wonderboymusic]

Almost every time is in an external library (boo) - but I did find 2 on us.

[wonderboymusic]

In 28633:

Cleanup for switch statements:

• Move default to the bottom in WP_Theme_Install_List_Table
• switch/endswitch syntax is not supported in Hack. Switch to switch (...) { .... } syntax. (A few template-type instances linger).

Fixes #28409.
See #27881.

[wonderboymusic]

In 28634:

Move default to the bottom in _wp_mysql_week().

See #28409.