Rename uart_server to uart_service for consistency

Author: nnja

examples/ble_bluefruit_color_picker.py

@@ -9,8 +9,8 @@
 from adafruit_bluefruit_connect.color_packet import ColorPacket
 
 ble = BLERadio()
-uart_server = UARTService()
-advertisement = ProvideServicesAdvertisement(uart_server)
+uart_service = UARTService()
+advertisement = ProvideServicesAdvertisement(uart_service)
 
 pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, brightness=0.1)
 
@@ -22,7 +22,7 @@
     ble.stop_advertising()
 
     while ble.connected:
-        packet = Packet.from_stream(uart_server)
+        packet = Packet.from_stream(uart_service)
         if isinstance(packet, ColorPacket):
             print(packet.color)
             pixels.fill(packet.color)