[Keyboard] IDOBAO ID67 code touch-ups and include factory keymap (#17231)

keyboards/idobao/id67/post_rules.mk

@@ -2,13 +2,7 @@
 #  this enables switching off thoes LEDs
 # Usage:  `make idobao/id67:default UNDERGLOW=off`
 
-ifeq ($(findstring off,$(UNDERGLOW)), off)
-  $(info ** UNDERGLOW OFF)
-  OPT_DEFS += -DID67_DISABLE_UNDERGLOW
-else ifeq ($(findstring no,$(UNDERGLOW)), no)
-  $(info ** NO UNDERGLOW)
-  OPT_DEFS += -DID67_DISABLE_UNDERGLOW
-else ifeq ($(findstring 0,$(UNDERGLOW)), 0)
-  $(info ** Nil UNDERGLOW)
+UNDERGLOW ?= yes
+ifneq ($(strip $(UNDERGLOW)), yes)
   OPT_DEFS += -DID67_DISABLE_UNDERGLOW
 endif