Rename deprecated light rgb_order to channel_colors

ESPHome renamed the esp32_rmt_led_strip platform's rgb_order option to
channel_colors; update all devices using it.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mcu-nspanel-office-r.yaml

@@ -278,7 +278,7 @@ light:
   - platform: esp32_rmt_led_strip
     name: Presence Light
     id: neo
-    rgb_order: GRB
+    channel_colors: GRB
     pin: 23
     num_leds: 3
     # rmt_channel: 0