fix(sqllab): demote "Save as new" button from primary to secondary (#39179)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
(cherry picked from commit 140f0001f2)

superset-frontend/src/SqlLab/components/SaveQuery/index.tsx

@@ -233,7 +233,7 @@ const SaveQuery = ({
               {t('Cancel')}
             </Button>
             <Button
-              buttonStyle={isSaved ? undefined : 'primary'}
+              buttonStyle={isSaved ? 'secondary' : 'primary'}
               onClick={onSaveWrapper}
               cta
             >