fix: includes '-' as filter option for each filter

src/User/Database/ProviderList.php

@@ -26,7 +26,7 @@ class ProviderList
 
     public static function asSelectOptions(): array
     {
-        $result = [];
+        $result = ['-' => '-'];
         foreach (static::$providers as $provider) {
             $result[$provider] = $provider;
         }