fix default template color

ot_templating/Classes/Templating/TemplateRepository.php

@@ -32,7 +32,7 @@ class TemplateRepository
     CONST defaultTemplate = 'Classic';
 
     CONST defaultPreferences = [
-        'themeColor' => 'lightblue',
+        'themeColor' => 'light-blue',
         'displayCarousel' => '1',
         'displayBreadcrumb' => '1',
     ];