Remove unused import of official colors in SelectablePagePageList styles

apps/app/src/features/openai/client/components/AiAssistant/AiAssistantManagementModal/SelectablePagePageList.module.scss

@@ -1,6 +1,5 @@
 @use '~/styles/variables' as var;
 @use '@growi/core-styles/scss/bootstrap/init' as bs;
-@use '@growi/core-styles/scss/variables/growi-official-colors';
 
 
 // == Colors