Rename keyboards with uppercase letters (#18268)

keyboards/maple_computing/christmas_tree/v2017/info.json

@@ -0,0 +1,5 @@
+{
+    "usb": {
+        "device_version": "20.1.7"
+    }
+}

keyboards/maple_computing/christmas_tree/v2017/rules.mk

@@ -0,0 +1,3 @@
+BACKLIGHT_ENABLE = yes      # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable WS2812 RGB underlight.
+AUDIO_ENABLE = no           # Audio output

keyboards/maple_computing/christmas_tree/v2017/v2017.c

@@ -0,0 +1 @@
+#include "v2017.h"

keyboards/maple_computing/christmas_tree/v2017/v2017.h

@@ -0,0 +1,3 @@
+#pragma once
+
+#include "christmas_tree.h"