fix(driver): persist brightness when message includes save and b

Co-authored-by: Cursor <cursoragent@cursor.com>

src/controller_messages.py

@@ -46,6 +46,8 @@ def process_data(payload, settings, presets, controller_ip=None):
         presets.save()
     if "save" in data and "clear_presets" in data:
         presets.save()
+    if "save" in data and "b" in data:
+        settings.save()
 
 
 def apply_brightness(data, settings, presets):