Metrics> Maps > fix getting user locations (#2503)

* Removed hardcoding

* Ensure correct db table prefix is used + Confirm user exists on get_user_location

* Additional sql user checks

* Ensure removed multisite user locations are not displayed

dt-mapping/mapping-queries.php

@@ -1317,10 +1317,11 @@ public static function post_type_geojson( $post_type, $args = [], $offset = 0, $
  SELECT u.display_name AS name, um.meta_value AS post_id, lgm.lng, lgm.lat
  FROM $wpdb->dt_location_grid_meta AS lgm
  JOIN $wpdb->users AS u ON ( u.ID = lgm.post_id )
- LEFT JOIN wp_usermeta AS um ON ( u.ID = um.user_id AND um.meta_key = 'wp_corresponds_to_contact' )
+ LEFT JOIN $wpdb->usermeta AS um ON ( u.ID = um.user_id AND um.meta_key = %s )
+ INNER JOIN $wpdb->usermeta AS um_cap ON ( u.ID = um_cap.user_id AND um_cap.meta_key = %s )
  WHERE lgm.post_type = %s
  LIMIT %d, %d;
- ", 'users', $offset, $limit );
+ ", ( $wpdb->prefix . 'corresponds_to_contact' ), ( $wpdb->prefix . 'capabilities' ), 'users', $offset, $limit );
 
  } else {
  $prepared_query = $wpdb->prepare( "