points types screen: pass points type array to add_meta_boxes action

Improves compatibility with other plugins that hook into this action
and expect two arguments to always be passed.

Fixes #765

src/components/points/admin/classes/screen/points/types.php

@@ -639,7 +639,7 @@ public function load() {
 			$this->current_points_type = $tab;
 		}
 
-		do_action( 'add_meta_boxes', $this->id );
+		do_action( 'add_meta_boxes', $this->id, $this->current_points_type );
 
 		$this->tabs = $tabs;
 	}