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-air-office-r.yaml

@@ -49,7 +49,7 @@ light:
   - platform: esp32_rmt_led_strip
     # name: LED
     id: neo
-    rgb_order: GRB
+    channel_colors: GRB
     pin: 27
     num_leds: 1
     chipset: ws2812
@@ -57,7 +57,7 @@ light:
   - platform: esp32_rmt_led_strip
     name: NEO
     id: neo_strip
-    rgb_order: GRB
+    channel_colors: GRB
     pin: 25
     num_leds: 7
     chipset: ws2812