Fixed the broken user-approved-filter (WP 4.4+)

[judomu]

Fixed the broken user-approved-filter by extending it to use two separate inputs for the top and bottom bar.

The PR fixes the Issue-#42. Instead of the PR-#43 it uses the $which-parameter (provided by WordPress since Release 4.6.0), see code:

/**
 * Fires just before the closing div containing the bulk role-change controls
 * in the Users list table.
 *
 * @since 3.5.0
 * @since 4.6.0 The `$which` parameter was added.
 *
 * @param string $which The location of the extra table nav markup: 'top' or 'bottom'.
 */
do_action( 'restrict_manage_users', $which );

[picklewagon]

This is great! Thank you for this PR. I'm working on an update and this will be included.