make riverlea default theme light for WP package

civicrm/ext/riverlea/settings/riverlea.setting.php

@@ -7,7 +7,7 @@ return [
     'name' => 'riverlea_dark_mode_backend',
     'group' => 'riverlea',
     'type' => 'String',
-    'default' => 'inherit',
+    'default' => 'light',
     'html_type' => 'select',
     'add' => 1.0,
     'title' => E::ts('Backend Dark Mode Control'),
@@ -29,7 +29,7 @@ return [
     'name' => 'riverlea_dark_mode_frontend',
     'group' => 'riverlea',
     'type' => 'String',
-    'default' => 'inherit',
+    'default' => 'light',
     'html_type' => 'select',
     'add' => 1.0,
     'title' => E::ts('Frontend Dark Mode Control'),