Fix daemon key provider service

Handles missing keys if user is an admin or the server owner. Step in the right direction for #733 where all users have their own keys now. Still need to address admin status revocation in order to fully address that issue.

app/Contracts/Repository/DaemonKeyRepositoryInterface.php

@@ -24,6 +24,8 @@
 
 namespace Pterodactyl\Contracts\Repository;
 
+use Pterodactyl\Models\DaemonKey;
+
 interface DaemonKeyRepositoryInterface extends RepositoryInterface
 {
     /**
@@ -31,6 +33,15 @@ interface DaemonKeyRepositoryInterface extends RepositoryInterface
      */
     const INTERNAL_KEY_IDENTIFIER = 'i_';
 
+    /**
+     * Load the server and user relations onto a key model.
+     *
+     * @param \Pterodactyl\Models\DaemonKey $key
+     * @param bool                          $refresh
+     * @return \Pterodactyl\Models\DaemonKey
+     */
+    public function loadServerAndUserRelations(DaemonKey $key, bool $refresh = false): DaemonKey;
+
     /**
      * Gets the daemon keys associated with a specific server.
      *